function openImagePopup( htmlUrl, imageURL, title, altText, width, height )
{
    if ( window.name == "" )
      window.name = "Scoyo Image-Popup";

    title = encodeURI(title);
    altText = encodeURI(altText);

    width = parseInt(width);
    width = Math.max( width, 350 ); // min-width: 330 plus padding
    height = parseInt(height);

    var popupWindow = window.open( htmlUrl + "?img=" + imageURL + "&title=" + title + "&alt=" + altText, "PopUpWindow", "width=" + width + ",height=" + height + ",location=no,menubar=no,status=no,toolbar=no" );

    if ( popupWindow ) popupWindow.focus();
}