function windowOpen(U,N,W,H){
	var W;
	var centerH=(screen.height-H)/2;
	var centerW=(screen.width-W)/2;
W=window.open(U,N,'toolbar=0,menubar=0,location=0,directories=0,status=0,resizable=yes,scrollbars=no,width='+ W +',height='+ H +',left='+ centerW +',top='+ centerH +'');
	W.focus();
}