function mostra_fabricants(plana)
 {
  plana_fabricants=window.open(plana,"fabricants","width=570,height=400,status=no,scrollbars=yes,resizable=no,menubar=no,top=10,left=10");
  plana_fabricants.focus();
 }

function mostra_areausuaris(plana)
 {
  plana_usuaris=window.open(plana,"usuaris","width=550,height=380,status=no,scrollbars=yes,resizable=no,menubar=no,top=10,left=10");
  plana_usuaris.focus();
 }

function mostra_contactar(plana)
 {
  plana_contactar=window.open(plana,"contactar","width=400,height=430,status=no,scrollbars=no,resizable=no,menubar=no,top=10,left=10");
  plana_contactar.focus();
 }

function mostra_registre(plana)
 {
  plana_registre=window.open(plana,"registre","width=700,height=500,status=no,scrollbars=yes,resizable=yes,menubar=no,top=10,left=10");
  plana_registre.focus();
 }