function openDialogWindow(filename,w,h)
{
	var wl = (screen.width - w) / 2;
	var wt = (screen.height - h) / 2;
	var size = ("resizable=0,scrollbars=0,left=" + wl + ",top=" + wt +",width=" + w + ",height=" + h);
	popupwindow=window.open(filename,"popup",size);
	setTimeout('popupwindow.focus();',250);
}