// Script by Thomas Stich
// http://www.stichpunkt.de/beitrag/popup.html
// use it if you like it
// 
// <a href="html-or.jpg" onclick="return popup(this,123,456)" title="..."
// or
// <a href="html-or.jpg" onclick="return popup(this)" title="..."


var pop = null;

function popdown() {
    if (pop && !pop.closed) pop.close();
}

function popup(obj,w,h) {
    var url = (obj.getAttribute) ? obj.getAttribute('href') : obj.href;
    if (!url) return true;
    w = (w) ? w += 20 : 150;  // 150px*150px is the default size
    h = (h) ? h += 25 : 150;
    var args = 'width='+w+',height='+h+',resizable';
    popdown();
    pop = window.open(url,'',args);
    return (pop) ? false : true;
}

window.onunload = popdown;
window.onfocus = popdown;