function popup(URL)
{	
	window.name='PDF_Window';	
	var win_properties;
	win_properties = 'menubar=No,status=no,scrollbars=No,resizable=yes,width=900,height=500,top=' + ((screen.height-500)/2) + ',left=' + ((screen.width-900)/2)
	var walk;
	walk=window.open('/popup.asp?url='+URL,'PDF_Viewer',win_properties  );
	//walk=window.open(URL,'PDF_Viewer',win_properties  );
	walk.focus()	
				
}