/*    
    shared.js
    ===============================================================
    NSU - Shared functions
    
    Created:
        24.03.2009 by DS    
    History: 
        2011-05-03 - TWW added cookie handling functions
        2011-06-10 - TWW moved UDM open/close functions from page foundations
    
    @ setCookie
    @ setSessionCookie
    @ getCookie
    @ detectbrowser
    @ add_event
    @ remove_event
    @ add_load_event
    @ get_style
    _______________________________________________________________
*/

    var whichbrowser;

    /* cookie funtions */
    function setCookie(c_name, value, expires) {
        var exdate = new Date();
        if (expires===undefined) expires=100;
        exdate.setDate(exdate.getDate() + expires);
        document.cookie = c_name + "=" + escape(value) + ";expires=" + exdate.toUTCString();
    }
    function setSessionCookie(c_name, value) { 
        //cookie for this session only
        document.cookie = c_name + "=" + escape(value) + ";"
    }
    function getCookie(c_name) {
        if (document.cookie.length > 0) {
            c_start = document.cookie.indexOf(c_name + "=");
            if (c_start != -1) {
                c_start = c_start + c_name.length + 1;
                c_end = document.cookie.indexOf(";", c_start);
                if (c_end == -1) c_end = document.cookie.length;
                return unescape(document.cookie.substring(c_start, c_end));
            }
        }
        return "";
    }

    /* popup menus scripting */
    //open menu with given ID 
    function openMenu(menuID,linkObj) {
        //if the menu code is ready
       
        if(um.ready) {
            //find co-ordinates of link object
            var coords = {'x' : um.getRealPosition(linkObj,'x'),'y' : um.getRealPosition(linkObj,'y')};
            //increase y-position to place it below the link
            coords.y += (linkObj.offsetHeight + 4);
            //activate menu at returned co-ordinates
            um.activateMenu(menuID, coords.x + 'px', coords.y + 'px');
        }
    }
    
    //close menu with given ID
    function closeMenu(menuID) {
        //if the menu code is ready
        
        if(um.ready) {
            //deactive menu
            //um.deactivateMenu(menuID);
            //reset the menus
            um.closeAllMenus();
        }
    } 

    
    function detectbrowser() 
    {    
        // Browser Detect  v2.1.6
        // documentation: http://www.dithered.com/javascript/browser_detect/index.html
        // license: http://creativecommons.org/licenses/by/1.0/
        // code by Chris Nott (chris[at]dithered[dot]com)    
        
        var ua = navigator.userAgent.toLowerCase(); 
        
        // browser engine name
        this.isGecko       = (ua.indexOf('gecko') != -1 && ua.indexOf('safari') == -1);   
        
        // browser name
        this.isKonqueror   = (ua.indexOf('konqueror') != -1); 
        this.isSafari      = (ua.indexOf('safari') != - 1);
        this.isOmniweb     = (ua.indexOf('omniweb') != - 1);
        this.isOpera       = (ua.indexOf('opera') != -1);
        this.isIcab        = (ua.indexOf('icab') != -1); 
        this.isAol         = (ua.indexOf('aol') != -1); 
        this.isIE          = (ua.indexOf('msie') != -1 && !this.isOpera && (ua.indexOf('webtv') == -1) ); 
        this.isMozilla     = (this.isGecko && ua.indexOf('gecko/') + 14 == ua.length);
        this.isFirefox    = (ua.indexOf('firefox/') != -1);
        this.isNS          = ( (this.isGecko) ? (ua.indexOf('netscape') != -1) : ( (ua.indexOf('mozilla') != -1) && !this.isOpera && !this.isSafari && (ua.indexOf('spoofer') == -1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('webtv') == -1) && (ua.indexOf('hotjava') == -1) ) );
        
        // spoofing and compatible browsers
        this.isIECompatible = ( (ua.indexOf('msie') != -1) && !this.isIE);
        this.isNSCompatible = ( (ua.indexOf('mozilla') != -1) && !this.isNS && !this.isMozilla);    
    
        // rendering engine versions
        this.geckoVersion = ( (this.isGecko) ? ua.substring( (ua.lastIndexOf('gecko/') + 6), (ua.lastIndexOf('gecko/') + 14) ) : -1 );
        this.equivalentMozilla = ( (this.isGecko) ? parseFloat( ua.substring( ua.indexOf('rv:') + 3 ) ) : -1 );
        this.appleWebKitVersion = ( (this.isAppleWebKit) ? parseFloat( ua.substring( ua.indexOf('applewebkit/') + 12) ) : -1 );
        
        // browser version
        this.versionMinor = parseFloat(navigator.appVersion);     
    
       // correct version number
        if (this.isGecko && !this.isMozilla) {
          this.versionMinor = parseFloat( ua.substring( ua.indexOf('/', ua.indexOf('gecko/') + 6) + 1 ) );
        }
        else if (this.isMozilla) {
          this.versionMinor = parseFloat( ua.substring( ua.indexOf('rv:') + 3 ) );
        }
        else if (this.isIE && this.versionMinor >= 4) {
          this.versionMinor = parseFloat( ua.substring( ua.indexOf('msie ') + 5 ) );
        }
        else if (this.isKonqueror) {
          this.versionMinor = parseFloat( ua.substring( ua.indexOf('konqueror/') + 10 ) );
        }
        else if (this.isSafari) {
          this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('safari/') + 7 ) );
        }
        else if (this.isOmniweb) {
          this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('omniweb/') + 8 ) );
        }
        else if (this.isOpera) {
          this.versionMinor = parseFloat( ua.substring( ua.indexOf('opera') + 6 ) );
        }
        else if (this.isIcab) {
          this.versionMinor = parseFloat( ua.substring( ua.indexOf('icab') + 5 ) );
        }
        
        this.versionMajor = parseInt(this.versionMinor, 10); // base 10 added for js link validation
        
        // dom support
        this.isDOM1 = (document.getElementById);
        this.isDOM2Event = (document.addEventListener && document.removeEventListener);
        
        // css compatibility mode
        this.mode = document.compatMode ? document.compatMode : 'BackCompat';
        
        // platform
        this.isWin    = (ua.indexOf('win') != -1);
        this.isWin32  = (this.isWin && ( ua.indexOf('95') != -1 || ua.indexOf('98') != -1 || ua.indexOf('nt') != -1 || ua.indexOf('win32') != -1 || ua.indexOf('32bit') != -1 || ua.indexOf('xp') != -1) );
        this.isMac    = (ua.indexOf('mac') != -1);
        this.isUnix   = (ua.indexOf('unix') != -1 || ua.indexOf('sunos') != -1 || ua.indexOf('bsd') != -1 || ua.indexOf('x11') != -1);
        this.isLinux  = (ua.indexOf('linux') != -1); 
        
        // detect ie version
        this.isIE4x = ((this.isIE) && (this.versionMajor == 4));        
        this.isIE5x = (this.isIE && this.versionMajor == 5);
        this.isIE55 = (this.isIE && this.versionMinor == 5.5);
        this.isIE5up = (this.isIE && this.versionMajor >= 5);
        this.isIE6x = (this.isIE && this.versionMajor == 6);
        this.isIE6up = (this.isIE && this.versionMajor >= 6);
        this.isIE7x = (this.isIE && this.versionMajor == 7);    
        this.isIE7up = (this.isIE && this.versionMajor >= 7);    
        
        // detect ns version
        this.isNS6x = (this.isNS && this.versionMajor == 6);
    
        // detect opera version
        this.isOpera6 = ((this.isOpera) && (this.versionMajor <= 6));    
        
        this.isSafari2 = ((this.isSafari) && (this.versionMajor <= 419.3));
        
        // Supported browsers: IE6+, FF2+, Safari 3+    
        if ((this.isIE6up) || ((this.isSafari) && (this.versionMajor > 419.3)) || ((this.isFirefox) && (this.versionMajor >=2)))
        {        
            this.isHiFi = true;                    
        }    
        else
        {    
            this.isHiFi = false;                        
        }
    }
    // init
    whichbrowser = new detectbrowser();    
    
    function add_event(obj, evType, fn, useCapture)
    {
        // http://www.scottandrew.com/weblog/articles/cbs-events
        
        if (obj.addEventListener)
        {
            obj.addEventListener(evType, fn, useCapture);
            return true;
        } 
        else if (obj.attachEvent)
        {
            var r = obj.attachEvent('on' + evType, fn);
            return r;
        } 
        else 
        {
            alert("Handler could not be attached");
        }
    }    
    
    
    function process_stylesheet(styleSheet, ruleName, test)
    {
        var test_str = '';        
        
        var ii=0; // Initialize subCounter.                               
        var cssRule = false; // Initialize cssRule. 
        do // For each rule in stylesheet
        {
            if (styleSheet.cssRules) // Browser uses cssRules?
            {
                // FF
                 cssRule = styleSheet.cssRules[ii];
            } 
            else 
            { 
                // IE
                cssRule = styleSheet.rules[ii]; 
            } 
            if (cssRule) // If we find a rule  
            {                            
                if (cssRule.selectorText) // DS start check, else error
                {    
                    if (test == 'test')
                    {                            
                        test_str += (cssRule.selectorText.toLowerCase() + "\n\r");
                    }
                
                    if (cssRule.selectorText.toLowerCase() == ruleName) // does the rule name match  
                    {
                        return cssRule; // return the style object.
                    }                                 
                } // DS end check, else error                                 
            } // end found cssRule
            ii++; // Increment sub-counter
        } 
        while (cssRule); // end While loop        
        
        if (test === 'test')
        {                            
            alert(test_str); // outputs an alert listing all available selectors
        }                
        
        return false;
    }    
    
    function getCSSRule(ruleName, test)
    {
    // Return requested style object    
    // http://www.hunlock.com/blogs/Totally_Pwn_CSS_with_Javascript
    // Cut down by DS to remove unneeded add/edit functionality, 
    //  then extended to allow for @imports (as structuralNSU.css is imported rather than linked)
        
        // Convert test string to lower case.
        ruleName = ruleName.toLowerCase();     
        // if there are linked stylesheets, check them first
        if (document.styleSheets) 
        { 
             for (var i=0; i<document.styleSheets.length; i++) 
            {
                var linkedSheet = document.styleSheets[i]; 
                
                var result = process_stylesheet(linkedSheet, ruleName, test);        
                if (result !== false)
                {
                    return result;
                }
            } // end For loop
            
            // if the script got this far, it means that no match has been found yet, so check any imported stylesheets as well
            
             for (var j=0; j<document.styleSheets.length; j++) 
            {                            
                // check for imported stylesheets, either an @import within a stylesheet, or one within a style block (only the latter has been tested)                
                var linkedSheet2 = document.styleSheets[j];                                 
                var importedSheet = false;    
                
                if (linkedSheet2.imports) // IE
                {
                    if (linkedSheet2.imports.length > 0) // this prevents IE from throwing a nasty 'invalid procedure call or argument' error
                    {
                        importedSheet = linkedSheet2.imports[0];
                    }
                } 
                else // FF
                {                                    
                    importedSheet = linkedSheet2.cssRules[0].styleSheet;
                }    
                
                // if this stylesheet/style block uses an @import, check the imported stylesheet for the ruleName
                
                if (importedSheet)
                {
                    var result2 = process_stylesheet(importedSheet, ruleName, test);        
                    if (result2 !== false)
                    {
                        return result2;
                    }                    
                }            
                
            } // end For loop            
        } // end styleSheet ability check        
        
        return false; // nothing found
    } // end getCSSRule 
    
    function to_hex(N) 
    {
        // http://www.linuxtopia.org/online_books/javascript_guides/javascript_faq/rgbtoHex.htm        
     if (N === null) 
     {
         return "00";
     }
     N = parseInt(N, 10); 
     if (N === 0 || isNaN(N)) 
     {
         return "00";
     }
     N = Math.max(0,N); 
     N = Math.min(N,255); 
     N = Math.round(N);
     return ("0123456789ABCDEF".charAt((N-N%16)/16) + "0123456789ABCDEF".charAt(N%16));
    }        
    
    function rgb_to_hex(color)
    {    
        // FF formats the color as RGB, so we need to convert it to hex for sIFR
        if (color.indexOf('rgb') != -1)        
        {
            // rgb(193, 19, 30)
            var colors = color.replace('rgb(', '');
                    colors = colors.replace(')', '');
                    colors = colors.replace(' ', '');        
            
            // 193,19,30
            var colors_array = colors.split(',');
            var r = colors_array[0];
            var g = colors_array[1];
            var b = colors_array[2];        
    
            // http://www.linuxtopia.org/online_books/javascript_guides/javascript_faq/rgbtoHex.htm
            var hex_string = ('#' + to_hex(r) + to_hex(g) + to_hex(b));
            
            return (hex_string.toLowerCase());
        }
        else
        {
            // IE already formats the color as hex
            return (color.toLowerCase());
        }
    }
    
    function get_theme_colour()
    {
        var theme_color;
        
        if (whichbrowser.isHiFi)
        {
            var contentHeaderBlock_h1 = getCSSRule('.contentHeaderBlock h1', 'notest');
        }
        
        if (contentHeaderBlock_h1)
        {        
            theme_color = rgb_to_hex(contentHeaderBlock_h1.style.color);    
        }        
        else
        {
            // a hardcoded hex, just in case.
            theme_color = '#008882';
        }        
        
        return theme_color;
    }
    
    function get_flash_theme_colour()    
    {
        // var theme_colour = '0x' + get_theme_colour().substr(1);    
        var theme_colour = '0x00bbb2'; // from design - note that this is not actually the theme colour
        
        return theme_colour;
    }