problema onclick="load(this); en firefox

[djskpa]

Hola.
Aqui está la función:

function changeBack3(){

var elem = document.getElementById("imageMenu");
elem.className = "imageMenuC1";
elem.style.position="relative";
elem.style.top="1px";


elem = document.getElementById("img1");
elem.src = "images/gtd/portada/ILLU_CALIDAD_02.gif";
elem.style.left="-3px";
elem.style.top="-1px";


elem = document.getElementById("img2");
elem.src= "images/gtd/portada/nada.gif";

elem = document.getElementById("midImage");
elem.width = "301px";


elem = document.getElementById("detalles");
elem.style.position="relative";
elem.style.left="0px";
elem.name="menujsprincipal";


elem = document.getElementById("divFrame");
elem.width = "425px";


}

Saludos.
Muchas Gracias.