<!--hide
browserName=navigator.appName;
browserVer=parseInt(navigator.appVersion);
  if ((browserName=="Netscape" && browserVer>=3) || (browserName=="Microsoft Internet Explorer" && browserVer>=4))   
  version="n3";
  else
    version="n2";
  if (version=="n3")
     {c1on= new Image(153,45);
     c1on.src="images/boton_2.gif"; 
     c1off= new Image(153,45);
     c1off.src="images/boton_1.gif";
}

function encend(imgName)
 {
   if (version=="n3")
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function apagar(imgName)
 {
   if (version=="n3")
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }

//-->