// from http://tutorials.mezane.org/tabbed-navigation-using-css/
// Written by Andreas Blixt <andreasblixt@msn.com> May, 2007


// getElementsByClass Function

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\s)'+searchClass+'(\\s|$)');
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}


// CSS helper functions// CSS helper functions
CSS = {
    // Adds a class to an element.
    AddClass: function (e, c) {
        if (!e.className.match(new RegExp("\\b" + c + "\\b", "i")))
            e.className += (e.className ? " " : "") + c;
    },

    // Removes a class from an element.
    RemoveClass: function (e, c) {
        e.className = e.className.replace(new RegExp(" \\b" + c + "\\b|\\b" + c + "\\b ?", "gi"), "");
    }
}

// Functions for handling tabs.
Tabs = {
    // Changes to the tab with the specified ID.
    GoTo: function (contentId, skipReplace) {
        // This variable will be true if a tab for the specified
        // content ID was found.
        var foundTab = false;

        // Get the TOC element.
        var toc = document.getElementById("toc");
        if (toc) {
            var lis = toc.getElementsByTagName("li");
            for (var j = 0; j < lis.length; j++) {
                var li = lis[j];

                // Give the current tab link the class "current" and
                // remove the class from any other TOC links.
                var anchors = li.getElementsByTagName("a");
                for (var k = 0; k < anchors.length; k++) {
                    if (anchors[k].hash == "#" + contentId) {
                        CSS.AddClass(li, "current");
                        foundTab = true;
                        break;
                    } else {
                        CSS.RemoveClass(li, "current");
                    }
                }
            }
        }

        // Show the content with the specified ID.
        var divsToHide = [];
        var divs = document.getElementsByTagName("div");
        for (var i = 0; i < divs.length; i++) {
            var div = divs[i];

            if (div.className.match(/\bcontent\b/i)) {
                if (div.id == "_" + contentId)
                    div.style.display = "block";
                else
                    divsToHide.push(div);
            }
        }

        // Hide the other content boxes.
        for (var i = 0; i < divsToHide.length; i++)
            divsToHide[i].style.display = "none";

        // Change the address bar.
        if (!skipReplace) window.location.replace("#" + contentId);
    },

    OnClickHandler: function (e) {
        // Stop the event (to stop it from scrolling or
        // making an entry in the history).
        if (!e) e = window.event;
        if (e.preventDefault) e.preventDefault(); else e.returnValue = false;

        // Get the name of the anchor of the link that was clicked.
        Tabs.GoTo(this.hash.substring(1));
    },

    Init: function () {
        if (!document.getElementsByTagName) return;

        // Attach an onclick event to all the anchor links on the page.
        // originally : var anchors = document.getElementsByTagName("a");
        var anchors = getElementsByClass("tabs");
        for (var i = 0; i < anchors.length; i++) {
            var a = anchors[i];
            if (a.hash) a.onclick = Tabs.OnClickHandler;
        }

        var contentId;
        if (window.location.hash) contentId = window.location.hash.substring(1);

        var divs = document.getElementsByTagName("div");
        for (var i = 0; i < divs.length; i++) {
            var div = divs[i];

            if (div.className.match(/\bcontent\b/i)) {
                if (!contentId) contentId = div.id;
                div.id = "_" + div.id;
            }
        }

        if (contentId) Tabs.GoTo(contentId, true);
    }
};

// Hook up the OnLoad event to the tab initialization function.
window.onload = Tabs.Init;

// Hide the content while waiting for the onload event to trigger.
var contentId = window.location.hash || "#Introduction";

if (document.createStyleSheet) {
    var style = document.createStyleSheet();
    style.addRule("div.content", "display: none;");
    style.addRule("div" + contentId, "display: block;");
} else {
    var head = document.getElementsByTagName("head")[0];
    if (head) {
        var style = document.createElement("style");
        style.setAttribute("type", "text/css");
        style.appendChild(document.createTextNode("div.content { display: none; }"));
		style.appendChild(document.createTextNode("div" + contentId + " { display: block; }"));
        head.appendChild(style);
    }
}

// Customized stuff to make abstracts appear and dissappear as if by magic
function showAbstract(yearNo) {
    var showLink = document.getElementById( "show" + yearNo );
    var hideLink = document.getElementById( "hide" + yearNo );
    var abstractDisplay = document.getElementById( "abstract" + yearNo );
    showLink.style.display = "none";
    hideLink.style.display = "inline";
    abstractDisplay.style.display = "block";
}

function hideAbstract(yearNo) {
    var showLink = document.getElementById( "show" + yearNo );
    var hideLink = document.getElementById( "hide" + yearNo );
    var abstractDisplay = document.getElementById( "abstract" + yearNo );
    showLink.style.display = "inline";
    hideLink.style.display = "none";
    abstractDisplay.style.display = "none";
}
   
function hideThisId( _thisId) {
	var thisId = document.getElementById( _thisId );
	thisId.style.display = "none";
	}

function showThisId( _thisId) {
	var thisId = document.getElementById( _thisId );
	thisId.style.display = "block";
	}
  
function mouseoverLink(spanId) {
    var hoverOn = document.getElementById(spanId);
    hoverOn.style.color = "#FFFFFF";
    hoverOn.style.backgroundColor = "#800000";
}

function mouseoutLink(spanId) {
    var hoverOff = document.getElementById(spanId);
    hoverOff.style.color = "#332F93";
    hoverOff.style.backgroundColor = "#FFFFFF";
}