<!--

  //Precarga
  if (document.images) {
    // opcion 1
    var bn1 = new Image();
    bn1.src = "image/bn1.gif";
    var bn1sel= new Image();
    bn1sel.src = "image/bn1sel.gif";

    // opcion 2
    var bn2 = new Image();
    bn2.src = "image/bn2.gif";
    var bn2sel= new Image();
    bn2sel.src = "image/bn2sel.gif";
  }
  
 
  function rollOver(imName,over) {
    if (!document.images) {return};
    whichIm = document.images[imName];
    if (over) { 
      whichIm.src = "image/" + imName + "sel.gif" }
    else { 
      whichIm.src = "image/" + imName + ".gif" }
  }
// -->