function fenster(kat) 
{
	var doc = "erwerb_info.php?type=" + kat;	
	// document.write (doc);
	window.open(doc,"erwerb","directories=0,location=1,resizable=0,scrollbars=0,status=0,toolbar=0,screenX=300,screenY=30,width=600,height=400");
}

function customwindow(page,size_x,size_y) 
		{
			var options = "directories=0,location=0,resizable=0,status=0,toolbar=0,scrollbars=1,screenX=10,screenY=10,width=" + size_x + ",height=" + size_y;
			window.open(page,"Popup",options);
		}
	
function customwindow2(page,size_x,size_y) 
		{
			var options = "directories=0,location=0,resizable=0,status=0,toolbar=0,scrollbars=0,screenX=50,screenY=5,width=" + size_x + ",height=" + size_y;
			window.open(page,"Extra",options);
		}