function OpenPopup(url, name, attr) {
    //scrollbars=no,left=0,top=0,width=640,height=480,status=no,resizable=no
    var win = window.open(url, name, attr);

    if (win == 'undefined')
        alert('It appears you have a pop-up blocker turned on.  Please turn it off and try again.');
    else
        win.focus();
}

function OpenScreenshot(url) {
    OpenPopup('Screenshot.aspx?image=' + url, 'Screenshot', 'scrollbars=no,left=20,top=20,width=700,height=480,status=no,resizable=no');
}