function openWin(filename,width,height,scroll)
{
var left   = (screen.width  - width)/2;
var top    = (screen.height - height)/2;


var winZoom = window.open (filename,"PageWindow","width="+width+",height="+height+",top="+top+",left="+left+",location=no,menubar=no,resizable=no,scrollbars="+scroll+",status=no,toolbar=no");

winZoom.resizeTo(width,height);
winZoom.moveTo(left,top);
winZoom.focus();
}