function please_wait1()
		{
		document.all.pleasewaitScreen.style.pixelTop = (document.body.scrollTop + 50);
		document.all.pleasewaitScreen.style.visibility="visible";
		window.setTimeout('please_wait2()',1);
		}	

		function please_wait2()

		{
		lengthy_calculation();
		document.all.pleasewaitScreen.style.visibility="hidden";
		}
		function lengthy_calculation()
		{
		var x,y
		for(x=0;x<1000000;x++)
			{
			y += (x * y) / (y - x);			
			}
		}