tjpzoom.js no me funciona en firefox pero si en IE y chrome

[oliverarthurnardi]

Hola buenas chicos!!

tengo el siguiente script en mi página y me ha surgido un problema que cuando lo pruebo en firefox no me funciona.... cuando paso la lupa por encima de la imagen la imagen se me desaparece y el IE y los demas navegadores me funciona.

1ª parte del script:

Código Javascript:

function TJPzoomswitch(obj) {
 TJPon[obj]=((TJPon[obj])?(0):(1));
 return TJPon[obj];
}
 
function TJPzoomif(obj,highres) {
 if(TJPon[obj]) {TJPzoom(obj,highres);}
}
 
function TJPzoom(obj,highres) {
 if(!obj.style.width) {
  if(obj.width > 0) {
   //educated guess
   obj.style.width=obj.width+'px';
   obj.style.height=obj.height+'px';
  }
 }
 if(typeof(highres) != typeof('')) {highres=obj.src}
 var TJPstage=document.createElement("div");
 TJPstage.style.width=obj.style.width;
 TJPstage.style.height=obj.style.height;
 TJPstage.style.overflow='hidden';
 TJPstage.style.position='absolute';
 if(typeof(TJPstage.style.filter) != typeof(nosuchthing)) {
  //hi IE
  if(navigator.appVersion.indexOf('Mac') == -1) { //hi Mac IE
   TJPstage.style.filter='alpha(opacity=0)';
   TJPstage.style.backgroundColor='#ffffff';
  }
 } else {
  //hi decent gentlemen
  TJPstage.style.backgroundImage='transparent';
 }
 TJPstage.setAttribute('onmousemove','TJPhandlemouse(event,this);');
 TJPstage.setAttribute('onmousedown','TJPhandlemouse(event,this);');
 TJPstage.setAttribute('onmouseup','TJPhandlemouse(event,this);');
 TJPstage.setAttribute('onmouseout','TJPhandlemouse(event,this);');
 if(navigator.userAgent.indexOf('MSIE')>-1) {
  TJPstage.onmousemove = function() {TJPhandlemouse(event,this);}
  TJPstage.onmousedown = function() {TJPhandlemouse(event,this);}
  TJPstage.onmouseup = function() {TJPhandlemouse(event,this);}
  TJPstage.onmouseout = function() {TJPhandlemouse(event,this);}
 }
 obj.parentNode.insertBefore(TJPstage,obj);
 
 TJPwin=document.createElement("div");
 TJPwin.style.width='0px';
 TJPwin.style.height='0px';
 TJPwin.style.overflow='hidden';
 TJPwin.style.position='absolute';
 tw1='<div style="position:absolute;overflow:hidden;margin:';
 TJPwin.innerHTML= 
 tw1+TJPshadowthick+'px 0 0 '+TJPshadowthick+'px; background-color:'+TJPbordercolor+'; width:'+(TJPzoomwidth-TJPshadowthick*2)+'px;height:'+(TJPzoomheight-TJPshadowthick*2)+'px"></div>' +
 tw1+(TJPshadowthick+TJPborderthick)+'px 0 0 '+(TJPshadowthick+TJPborderthick)+'px; width:'+(TJPzoomwidth-TJPshadowthick*2-TJPborderthick*2)+'px;height:'+(TJPzoomheight-TJPshadowthick*2-TJPborderthick*2)+'px;"><img src="'+highres+'" style="margin:0;padding:0;border:0; width:'+(TJPzoomamount*parseInt(obj.style.width))+'px;height:'+(TJPzoomamount*parseInt(obj.style.height))+'px;" '+((highres != obj.src)?('onload="if(this.parentNode) {this.parentNode.parentNode.getElementsByTagName(\'div\')[2].style.display=\'none\';}"'):(''))+'/></div>';
 if(highres != obj.src) {
  TJPwin.innerHTML+='<div style="position:absolute; margin:'+(TJPshadowthick+TJPborderthick)+'px 0 0 '+(TJPshadowthick+TJPborderthick)+'px;">'+TJPloading+'</div>';
 }