/*
Functions for the Text Resizing buttons in the top bar of the common template
*/

function setSize(iSize)
{
    if(!document.getElementsByTagName)
        return false;
    var bodyTag = document.getElementsByTagName("body");
    for(var i=0; i < bodyTag.length; i++)
    {
        if(!bodyTag[i].style.fontSize)
        {
            if(!readCookie("UoB-textSize") || iSize == 'reset')
                bodyTag[i].style.fontSize = "80%";
            else
                bodyTag[i].style.fontSize =((parseFloat(readCookie("UoB-textSize"))) + "%");
        }
        else
        {
            if(!readCookie("UoB-textSize") || iSize == 'textnormal')
                bodyTag[i].style.fontSize = "80%";
            else if(iSize == 'textlarge')
                bodyTag[i].style.fontSize = "90%";
            else if(iSize == 'textlargest')
                bodyTag[i].style.fontSize = "100%";
            else if((iSize.charAt(0) == '+' && parseFloat(readCookie("UoB-textSize")) < 100) ||
                    (iSize.charAt(0) == '-' && parseFloat(readCookie("UoB-textSize")) > 60))
                bodyTag[i].style.fontSize = (((parseFloat(iSize)) + (parseFloat(readCookie("UoB-textSize")))) + "%");
        }
        var cookieValue = bodyTag[i].style.fontSize;
        writeCookie("UoB-textSize", cookieValue, 168);
    }
    return false;
}
function initResizeButton(id)
{
    if(document.getElementById && document.getElementById(id))
    {
        var link = document.getElementById(id);
        link.onclick = function() { 
          pageTracker._trackPageview('/'+id+'/'+ document.location);
          setSize(id); 
          return false; 
        }
    }
    return false;
}
function writeCookie(name, value, hours)
{
    var expire = "";
    if(hours != null)
    {
        expire = new Date((new Date()).getTime() + hours * 3600000);
        expire = "; expires=" + expire.toGMTString();
    }
    document.cookie = name + "=" + escape(value) + expire + '; path=/';
}
function readCookie(name)
{
    var cookieValue = "";
    var search = name + "=";
    if(document.cookie && document.cookie.length > 0)
    {
        var offset = document.cookie.indexOf(search);
        if(offset != -1)
        {
            offset += search.length;
            var end = document.cookie.indexOf(";", offset);
            if(end == -1)
                end = document.cookie.length;
            var cookieValue = unescape(document.cookie.substring(offset, end))
        }
    }
    return cookieValue;
}

/*
Functions for the expading menus in the left column of the common template
*/

function initMenu()
{
    if(!document.getElementById)
        return false;

    addEventHandler(document.getElementById('leftcol'), 1);

    function addEventHandler(currentElement, depth)
    {
        if(currentElement && currentElement.tagName && depth == 4 && currentElement.tagName == 'UL')
        {
            var topListItems = currentElement.childNodes;
            for(var j = 0; j < topListItems.length; j++)
            {
                var linksOrSubLists = topListItems[j].childNodes;
                for(var k = 0; k < linksOrSubLists.length; k++)
                {
                    if(linksOrSubLists[k].tagName && linksOrSubLists[k].tagName == 'A')
                        if(linksOrSubLists[k].href.replace(/\/index\.?(s?html?|php)?$/, '/') == document.location.href.replace(/\/index\.?(s?html?|php)?$/, '/'))
                            linksOrSubLists[k].className = 'highlight';
                    if(linksOrSubLists[k].tagName && linksOrSubLists[k].tagName == 'UL')
                    {
                        var topLinks = linksOrSubLists[k].parentNode.childNodes;
                        for(var z = 0; z < topLinks.length; z++)
                            if(topLinks[z].tagName && topLinks[z].tagName == 'A' && linksOrSubLists[k].className != 'static')
                                topLinks[z].onclick = function() { return showHideMenu(this) }
                        var subMenuOpen = linksOrSubLists[k].parentNode.className == 'open' ? true : false;
                        var subListItems = linksOrSubLists[k].childNodes;
                        for(var l = 0; l < subListItems.length; l++)
                        {
                            if(subListItems[l].tagName && subListItems[l].tagName == 'LI')
                            {
                                var subLinks = subListItems[l].childNodes;
                                for(var m = 0; m < subLinks.length; m++)
                                {
                                    if(subLinks[m].tagName && subLinks[m].tagName == 'A' && subLinks[m].href.replace(/\/index\.?(s?html?|php)?$/, '/') == document.location.href.replace(/\/index\.?(s?html?|php)?$/, '/'))
                                    {
                                        subLinks[m].className = 'highlight';
                                        subMenuOpen = true;
                                    }
                                }
                            }
                        }
                        if(subMenuOpen && linksOrSubLists[k].className != 'static')
                            linksOrSubLists[k].parentNode.className = 'submenuopen';
                        else if(linksOrSubLists[k].className != 'static')
                            linksOrSubLists[k].parentNode.className = 'submenu';
                    }
                }
            }
        }
        var i = 0;
        var currentElementChild = currentElement.childNodes[i];
        while(currentElementChild)
        {
            addEventHandler(currentElementChild, depth + 1);
            i++;
            currentElementChild = currentElement.childNodes[i];
        }
    }
    return false;
}
function showHideMenu(e)
{
    e.parentNode.className = e.parentNode.className == 'submenu' ? 'submenuopen' : 'submenu';
    return false;
}

/*
Initialisation of the elements
*/
// CSS for expanding menus
document.write("<style type='text/css'>\n#leftcol dd ul li ul {display:none}\n#leftcol dd ul li.submenu ul {display:none}\n#leftcol dd ul li.submenu a {background-image:url(/common/jsp/arrow.gif?p=36c);background-position:191px 4px;background-repeat:no-repeat;padding-right:12px;width:185px}\n#leftcol dd ul li.submenu a:hover {background:#cde url(/common/jsp/arrow.gif?p=36c) 191px 4px no-repeat}\n#leftcol dd ul li.submenuopen a {background-image:url(/common/jsp/arrow.gif?p=36c&d=down);background-position:188px 10px;background-repeat:no-repeat;padding-right:12px;width:185px}\n#leftcol dd ul li.submenuopen ul li a {padding-right:0}\n#leftcol dd ul li.submenuopen a:hover {background:#cde url(/common/jsp/arrow.gif?p=36c&d=down) 188px 10px no-repeat}\n#leftcol dd ul li ul.static {display:block}</style>");

// Onload functions
window.onload = function()
{
    // Expanding menus
    initMenu();

    // Text resize buttons
    initResizeButton("textnormal", "textnormal");
    initResizeButton("textlarge", "textlarge");
    initResizeButton("textlargest", "textlargest");
    setSize("80%");
}