function openURL(sURL) {
    opener.document.location = sURL;
}

var LeftPosition=(screen.availWidth)?(screen.availWidth-840)/2:50;
var TopPosition=(screen.availHeight)?(screen.availHeight-600)/2:50;

function openWin(sourceDoc) {
window.open(sourceDoc,"Window1","menubar=no,width=840,height=600,toolbar=no,status=no,scrollbars=yes,top="+TopPosition+",left="+LeftPosition);
}