if (document.images)
{
var claveOn = new Image();
claveOn.src = "images/clef.gif";
var claveOff = new Image();
claveOff.src = "images/blank.gif";
var clave2On = new Image();
clave2On.src = "images/clef.gif";
var clave2Off = new Image();
clave2Off.src = "images/blank.gif";
var clave3On = new Image();
clave3On.src = "images/clef.gif";
var clave3Off = new Image();
clave3Off.src = "images/blank.gif";
var clave4On = new Image();
clave4On.src = "images/clef.gif";
var clave4Off = new Image();
clave4Off.src = "images/blank.gif";
var clave5On = new Image();
clave5On.src = "images/clef.gif";
var clave5Off = new Image();
clave5Off.src = "images/blank.gif";
var clave6On = new Image();
clave6On.src = "images/clef.gif";
var clave6Off = new Image();
clave6Off.src = "images/blank.gif";
var clave7On = new Image();
clave7On.src = "images/clef.gif";
var clave7Off = new Image();
clave7Off.src = "images/blank.gif";
}

function mouseOn(imgName)
{
if (document.images)
   document[imgName].src = eval(imgName + "On.src");
}

function mouseOff(imgName)
{
if (document.images)
   document[imgName].src = eval(imgName + "Off.src");
}