var selectedList;
var availableList;
function createListObjects(){
	availableList=document.getElementById("availableOptions");
	selectedList=document.getElementById("selectedOptions");
}

function delAttribute(){
	var selIndex = selectedList.selectedIndex;
	if(selIndex < 0)return;
	availableList.appendChild(selectedList.options.item(selIndex));
	selectNone(selectedList,availableList);
	//setSize(availableList,selectedList);
}

function addAttribute(){
	var addIndex = availableList.selectedIndex;
	if(addIndex < 0)return;
	selectedList.appendChild(availableList.options.item(addIndex));
	selectNone(selectedList,availableList);
	//setSize(selectedList,availableList);
}

function setTop(top){
	document.getElementById('someLayer').style.top = top;
}
function setLayerTop(lyr,top){
	lyr.style.top = top;
}

function setSize(list1,list2){
	list1.size = getSize(list1);
	list2.size = getSize(list2);
}

function selectNone(list1,list2){
	list1.selectedIndex = -1;
	list2.selectedIndex = -1;
	addIndex = -1;
	selIndex = -1;
}

function getSize(list){
    /* Mozilla ignores whitespace, 
       IE doesn't - count the elements 
       in the list */
    var len = list.childNodes.length;
    var nsLen = 0;
    //nodeType returns 1 for elements
	for(i=0; i<len; i++){
    		if(list.childNodes.item(i).nodeType==1)
            	nsLen++;
    }
    if(nsLen<2)
        return 2;
    else
        return nsLen;
}

function delAll(){
    var len = selectedList.length -1;
    for(i=len; i>=0; i--){
        availableList.appendChild(selectedList.item(i));
    }
    selectNone(selectedList,availableList);
    //setSize(selectedList,availableList);
}

function addAll(){
    var len = availableList.length -1;
    for(i=len; i>=0; i--){
        selectedList.appendChild(availableList.item(i));
    }
    selectNone(selectedList,availableList);
    //setSize(selectedList,availableList);
    
}

function showSelected(){
    var optionList =document.getElementById("selectedOptions").options;
    var data = '';
    var len = optionList.length;
    for(i=0; i<len; i++){
    	data += ',';
	data += optionList.item(i).value;
    }
    alert(data);
}