function openWin(url, windowName, width, height) {
    var win;
    var params;
    params = "toolbar=1,";
    params += "location=0,";
    params += "directories=1,";
    params += "status=0,";
    params += "menubar=0,";
    params += "scrollbars=1,";
    params += "left=50,";
    params += "width="+width+",";
    params += "height="+height;
    win = window.open(url, windowName, params);
}