function makeWindow(URL,x,y) {
  var popX=x;
  var popY=y;
  posX=((screen.availWidth/2)-(popX/2));
 	posY=((screen.availHeight/2)-(popX/2));
	window.open(URL,"Pagename","height="+popY+",width="+popX+",toolbar=0,menubar=0,directories=0,scrollbars=0,left="+posX+",top="+posY);
	}