/* 

List Expander 
written by Alen Grakalic, provided by Css Globe (cssglobe.com)
	
*/

this.listexpander = function() {

    // edit 

    var expandTo = 1; // level up to which you want your lists to be initially expanded. 1 is minimum
    var expandText = "Expand All"; // text for expand all button
    var collapseText = "Collapse All"; // text for collapse all button		
    var listClass = "listexpander" // class name that you want to assign to list(s). If you wish to change it make sure to update the css file as well  

    // end edit (do not edit below this line)

    this.start = function() {
        var ul = document.getElementsByTagName("ul");
        for (var i = 0; i < ul.length; i++) {
            if (ul[i].className == listClass) {
                create(ul[i]);
                buttons(ul[i])
            };
        };
    };

    this.create = function(list) {
        var items = list.getElementsByTagName("li");
        for (var i = 0; i < items.length; i++) {
            listItem(items[i]);
        };
    };

    this.listItem = function(li) {
        if (li.getElementsByTagName("ul").length > 0) {
            var ul = li.getElementsByTagName("ul")[0];
            ul.style.display = (depth(ul) <= expandTo) ? "block" : "none";
            li.className = (depth(ul) <= expandTo) ? "expanded" : "collapsed";
            li.over = true;
            ul.onmouseover = function() { li.over = false; }
            ul.onmouseout = function() { li.over = true; }
            li.onclick = function() {
                if (this.over) {
                    ul.style.display = (ul.style.display == "none") ? "block" : "none";
                    this.className = (ul.style.display == "none") ? "collapsed" : "expanded";
                };
            };
        };
    };

    this.buttons = function(list) {
        var parent = list.parentNode;
        var p = document.createElement("p");
        p.className = listClass;
        var a = document.createElement("a");
        a.innerHTML = expandText;
        a.onclick = function() { expand(list) };
        p.appendChild(a);
        var a = document.createElement("a");
        a.innerHTML = collapseText;
        a.onclick = function() { collapse(list) };
        p.appendChild(a);
        parent.insertBefore(p, list);
    };

    this.expand = function(list) {
        li = list.getElementsByTagName("li");
        for (var i = 0; i < li.length; i++) {
            if (li[i].getElementsByTagName("ul").length > 0) {
                var ul = li[i].getElementsByTagName("ul")[0];
                ul.style.display = "block";
                li[i].className = "expanded";
            };
        };
    };

    this.collapse = function(list) {
        li = list.getElementsByTagName("li");
        for (var i = 0; i < li.length; i++) {
            if (li[i].getElementsByTagName("ul").length > 0) {
                var ul = li[i].getElementsByTagName("ul")[0];
                ul.style.display = "none";
                li[i].className = "collapsed";
            };
        };
    };

    this.depth = function(obj) {
        var level = 1;
        while (obj.parentNode.className != listClass) {
            if (obj.tagName == "UL") level++;
            obj = obj.parentNode;
        };
        return level;
    };

    start();

};

window.onload = listexpander;