function open_pic(id, alt, section, page) {
   var pic_window = window.open('pics.php?section='+section+'&page='+page+'&id='+id+'&alt='+alt, id, 'directories=no,fullscreen=no,width=300,height=290,location=no,scrollbars=no,resizable=no,status=no,titlebar=no,toolbar=no');
   pic_window.focus();
}

function add_events() {
    var links = document.getElementsByTagName('img');
    var numlinks = links.length;
    for(var i = 0; i < numlinks; ++i) {
        if('products' == links[i].className) {
            links[i].onclick = function() {
                open_pic(this.id, this.alt, section, page);
            }
        }
    }
}

add_onload_handler(add_events);