function togglediv(id)
  {
    var status=getdiv(id);

    if(status=='none') showdiv(id);
    else hidediv(id)    
  }

  function getdiv(id)
  {
    var status='';
  	//safe function to hide an element with a specified id
  	if (document.getElementById) { // DOM3 = IE5, NS6
  		status=document.getElementById(id).style.display;
  	}
  	else {
  		if (document.layers) { // Netscape 4
  			status=document.id.display;
  		}
  		else { // IE 4
  			status=document.all.id.style.display;
  		}
  	}
    return status;
  }

function hidediv(id) {
	//safe function to hide an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'none';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'none';
		}
		else { // IE 4
			document.all.id.style.display = 'none';
		}
	}
}

function showdiv(id) {
	//safe function to show an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'block';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'block';
		}
		else { // IE 4
			document.all.id.style.display = 'block';
		}
	}
}
  
  //hidediv("level2");
  
  
function toggle(x)
{
  x.className = (x.className=='show') ? 'hide' : 'show';
}

function treeCollapse(){
  var list = document.getElementById('yourtree').getElementsByTagName('li');
  for(var i=0;i<list.length;i++) list[i].className = 'hide';
}

window.onload = function () 
{ 
  var tree = document.getElementById("tree"); 
  if(tree==null) return;
  var lists = [ tree ]; 

  for (var i = 0; i < tree.getElementsByTagName("ul").length; i++) 
    lists[lists.length] = tree.getElementsByTagName("ul")[i]; 
  for (var i = 0; i < lists.length; i++) 
  { 
     try
     {
       var item = lists[i].lastChild; 
       while (!item.tagName || item.tagName.toLowerCase() != "li")
        item = item.previousSibling; item.className += " last"; 
     }
     catch(err)
     {
       //Handle errors here
     }    
  } 
};