function forum_select(forum_ids,forum_names,forum_id) {
    select_name=Math.round(Math.random()*1000000000);

    w("<select name=select_name onChange=\"javascript: url='./topic_list.php?forum_id='+this.options[this.selectedIndex].value; tmp=this.options[this.selectedIndex].value;if(tmp.substring(0,5)!='none_') location.href=url; \">");                
    for(i = 0; i < forum_ids.length; i++)  {
        w("<option value="+forum_ids[i]);
        if (forum_ids[i]==forum_id) w(" selected");
        w(">"+forum_names[i]+"</option>");
    }
    w("</select>");
}