function ld_equip()
    {
       var doc=nb_equip.XMLDocument;
       doc.load("equip.xml");
       document.getElementById("head_id").innerHTML=
                                  "Equipment Details "; 
    
    }
    function ld_eng()
    {
       var doc_s=ds_staff.XMLDocument;
       doc_s.load("xml/hotjobs.xml");
       document.getElementById("head_id_d").innerHTML=
                                        "Staff Details "; 
    }