function winOpen(url,windowname,wid,hei){
	var futures = "width="+wid+",height="+hei+",resizable=yes,scrollbars=yes";
	var urldummy = url;
	var fset = window.open(urldummy, windowname, futures);
	var w = screen.width;
	var h = screen.height;
	var dw = (w - wid)/2;
	var dh = (h - hei)/2;
	fset.moveTo(dw, dh);
	fset.focus();
}