function $($id) {
	if( document.getElementById )
    	return document.getElementById($id);
  	else if( document.all ) // for g8 old ie
  		return document.all[$id];
  	else if( document.layers ) // for nn4
    	return document.layers[$id]; 
}
function showUI($id) {
	$($id).style.display = "block";
}
function hideUI($id) {
	$($id).style.display = "none";
}
function activate() {
	if(this.className=='')
		this.className = "active";
}
function activate($id) {
	var divId;
	divId = $($id);
	if(divId.className=='')
		divId.className = "active";
}
function shownAndHideUI($id)
{
  var elem, vis;
  
  elem = $($id);
  vis = elem.style;
  
  if((vis.display=='') && (elem.offsetWidth!=undefined) && (elem.offsetHeight!=undefined))
  	vis.display = ((elem.offsetWidth!=0) && (elem.offsetHeight!=0))?'block':'none';
  	vis.display = ((vis.display=='') || (vis.display=='block'))?'none':'block';
}