[Javascript] Displaying a Div Before Window.Open

[javascript@xxxxxxxxxx (javascript@xxxxxxxxxx)]

How can I display a div just before a Window Opens?

The Div- Hourglass - Shows after the window opens and I want it to 
show before. Please help me. The function is below.


function showFormKiller( RegID )
	{
	        oHourGlass = document.all.HourGlass
		oHourGlass.style.visibility = "visible";
		window.open( "FormKiller.asp?RegID=" + 
RegID , "FormKiller", 'fullscreen' );
		
	}