function expandTree( elementId ){
	document.getElementById( elementId ).className = "optionExpanded";
}

function collapseTree( elementId ){
	document.getElementById( elementId ).className = "optionCollapsed";
}

function changeTreeStatus( elementId ){
	elementClass = document.getElementById( elementId ).className;
	if ( elementClass == "optionExpanded" ){
		collapseTree( elementId );
	}else{
		expandTree( elementId );
	}
}