function Wopen(U,N,W,H){
	var WO1;
	var centerH=(screen.height-H)/2;
	var centerW=(screen.width-W)/2;
WO1=window.open(U,N,'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=yes,resizable=no,width='+ W +',height='+ H +',left='+ centerW +',top='+ centerH +'');
	WO1.focus();
			}