function CheckTree(myName) {
    this.myName=myName;this.root=null;
    this.countAllLevels=false;
    this.checkFormat='(%n%checked)';
    this.evtProcessed=navigator.userAgent.indexOf('Safari')>-1?'safRtnVal':'returnValue';CheckTree.list[myName]=this
};

CheckTree.list=[];CheckTree.prototype.init=function(){
    with(this){
	    if(!document.getElementById)return;root=document.getElementById('tree-'+myName);
		if(root){
            var lists=root.getElementsByTagName('ul');
		    for(var ul=0;ul<lists.length;ul++){lists[ul].style.display='none';lists[ul].treeObj=this;
                lists[ul].setBoxStates=setBoxStates;var fn=new Function('e','this.setBoxStates(e)');
		    if(lists[ul].addEventListener&&navigator.vendor!='Apple Computer,Inc.'){
                lists[ul].addEventListener('click',fn,false)
	        } else lists[ul].onclick=fn}root.treeObj=this;root.setBoxStates=setBoxStates;
		    if(root.addEventListener&&navigator.vendor!='Apple Computer,Inc.'){
                root.addEventListener('click',new Function('e',myName+'.click(e)'),false)
	        } else root.onclick=new Function('e',myName+'.click(e)');root.setBoxStates({},true,true);
                var nodes=root.getElementsByTagName('li');
		        for(var li=0;li<nodes.length;li++){
		            if(nodes[li].id.match(/^show-/)){
                        nodes[li].className=(nodes[li].className=='last'?'plus-last':'plus')
	                }
                }
        }
    }
};

CheckTree.prototype.click=function(e){
	with(this){
        e=e||window.event;var elm=e.srcElement||e.target;
		if(!e[evtProcessed]&&elm.id&&elm.id.match(/^check-(.*)/)){
			var tree=document.getElementById('tree-'+RegExp.$1);
			if(tree)tree.setBoxStates(e,true,false)
		} while(elm){
            if(elm.tagName.match(/^(input|ul)/i))break;
            if(elm.id&&elm.id.match(/^show-(.*)/)){
                var targ=document.getElementById('tree-'+RegExp.$1);
                if(targ.style){
                    var col=(targ.style.display=='none');targ.style.display=col?'block':'none';elm.className=elm.className.replace(col?'plus':'minus',col?'minus':'plus')
                }
                break
            }
            elm=elm.parentNode
        }
    }
};

function setBoxStates(e,routingDown,countOnly){
    with(this){
        if(!this.childNodes)return;e=e||window.event;
        var elm=e.srcElement||e.target;
        if(elm&&elm.id&&elm.id.match(/^check-(.*)/)&&!routingDown&&!e[treeObj.evtProcessed]){
            var refTree=document.getElementById('tree-'+RegExp.$1);
            if(refTree){
                refTree.setBoxStates(e,true,countOnly);
                e[treeObj.evtProcessed]=true
            }
        }
        var allChecked=true,boxCount=0,subBoxes=null;
        var thisLevel=this.id.match(/^tree-(.*)/)[1];
        var parBox=document.getElementById('check-'+thisLevel);
        for(var li=0;li<childNodes.length;li++){
            for(var tag=0;tag<childNodes[li].childNodes.length;tag++){
                var child=childNodes[li].childNodes[tag];
                if(!child)continue;
                if(child.tagName&&child.type&&child.tagName.match(/^input/i)&&child.type.match(/^checkbox/i)){
                    if(routingDown&&parBox&&elm&&elm.id&&elm.id.match(/^check-/)&&!countOnly)child.checked=parBox.checked;allChecked&=child.checked;
                    if(child.checked)boxCount++}if(child.tagName&&child.tagName.match(/^ul/i)&&(!e[treeObj.evtProcessed]||routingDown))child.setBoxStates(e,true,countOnly)
            }
        }
        if(!routingDown)e[treeObj.evtProcessed]=true;
        if(parBox&&parBox!=elm&&!countOnly)parBox.checked=allChecked;
        if(treeObj.countAllLevels){
            boxCount=0;
            var subBoxes=this.getElementsByTagName('input');
            for(var i=0;i<subBoxes.length;i++)if(subBoxes[i].checked)boxCount++
        }
        var countElm=document.getElementById('count-'+thisLevel);
        if(countElm){
            while(countElm.firstChild)countElm.removeChild(countElm.firstChild);
            if(boxCount)countElm.appendChild(document.createTextNode(treeObj.checkFormat.replace('%n%',boxCount)))
        }
    }
};

var chtOldOL=window.onload;window.onload=function(){
    if(chtOldOL)chtOldOL();
    for(var i in CheckTree.list)CheckTree.list[i].init()
};