function openPopup(href, window_name, width, height, is_resizable, show_scrollbar){
    window_name = window_name.replace(/ /g, "_"); // keine Spaces in window_name zulässig
    var params = '';
    if (is_resizable) {
        params = ',resizable=yes'
    } else {
        params = ',resizable=no'
    }
    if (show_scrollbar) {
        width = parseInt(width) + 16; // die Scrollbar braucht ja auch Platz...
        params += ',scrollbars=yes'
    } else {
        params += ',scrollbars=no'
    }
    params = 'width=' + width + ',height=' + height + params + ',dependent=yes,status=no,toolbar=no,location=no,directories=no,menubar=no';
    var temp = window.open(href, window_name, params);
    temp.focus();
}