if (document.images) {
enter_a = new Image(130,39);enter_a.src = 'img/btn_enter.gif';
enter_b = new Image(130,39);enter_b.src = 'img/btn_enter_ov.gif';
}

function di(id,name){
  if (document.images) {document.images[id].src=eval(name+".src"); }
}