// JavaScript Document
	var registry=new Array("","");
	
	function displayDV( ext )
	{
		obj = document.getElementById("dv" + ext)
		obj.style.display = 'block';
	}
	function hideDV( ext )
	{
		obj = document.getElementById("dv" + ext)
		obj.style.display = 'none';
	}
	
	function changeDV( ext, thelink )
	{
		obj = document.getElementById("dv" + ext);
		if (( obj.style.display == "none" ) || (  obj.style.display == "" ))
			{
				displayDV( ext );
				thelink.className = "menu_grey_click";
				hideRegisteredDV();
				registerDV( ext, thelink );
			}
		else
			{
				hideDV( ext );
				thelink.className = "menu_grey";
				unregisterDV( );
			}
	}
	
	function registerDV( ext, thelink )
	{
		registry[0]=ext;
		registry[1]=thelink;
	}
	
	function unregisterDV( )
	{
		registry[0]="";
		registry[1]=null;
	}
	
	function hideRegisteredDV()
	{
			if (registry[0] != "" )
				changeDV( registry[0],registry[1] );
	}