// Open a centered window  ////////
////////////////////////////////
function openwin(url,w,h,scroll)
{
scrwidth=screen.width;scrheight=screen.height;
leftmargin = (scrwidth - w)/2;topmargin = (scrheight - h)/2;
props = "left=" + leftmargin + ",";props = props + "top=" + topmargin + ",";props = props + "width=" + w+ ",";props = props + "height=" + h+ ",";
var windowprops= "left=" + leftmargin +",top=" + topmargin +",width="+w+",height="+h+",resizable=1,toolbar=no, location=no,fullscreen=0,scrollbars="+ scroll;
popup=window.open(url,'pop',windowprops);
popup.focus();
}