function OpenWindow (url, childName, width, height, scrollBar)
{
    var opWin;
    var left = (screen.width/2) - width/2;
    var top = (screen.height/2) - height/2;
    var styleStr = 'status=yes,toolbar=no,menubar=no,location=no,scrollbars=' + (scrollBar ? 'yes' : 'no')
    styleStr += ',width='+width+',height='+height+',left='+left+',top='+top+',screenX='+left+',screenY='+top;

    opWin = window.open(url, childName, styleStr);
    opWin.focus();
}