Problema con IE

Código HTML :

<input type = "radio" name = "color" value = "255, 0, 0" checked /> Red
<input type = "radio" name = "color" value = "0, 255, 0" /> Green
<input type = "radio" name = "color" value = "0, 0, 255" /> Blue
<div></div>

Código CSS :

div{
   width: 250px;
   height: 150px;
   background-color: rgb(255, 0, 0);
}

Código Javascript :

function change(color, element){
   var final = [] || new Array(),
       i = 0,
       current = window.getComputedStyle ? 
                 window.getComputedStyle(element, null).backgroundColor : 
                 element.currentStyle.backgroundColor;   
   window.interval = window.interval || null;   
      
   if (window.interval != null) 
      clearInterval(window.interval);

   current = current.split(/[^\d]/g);
   current = (function(){
      for (var k = 0, lengthCu = current.length, auxCu = [] || new Array(); k < lengthCu; k++)
         if (current[k].length) auxCu.push(current[k]);
      return auxCu;
   })();
      
   color = color.split(/[^\d]/g);
   color = (function(){
      for (var l = 0, lengthCo = color.length, auxCo = [] || new Array(); l < lengthCo; l++)
         if (color[l].length) auxCo.push(color[l]);
      return auxCo;
   })();

   final[0] = current[0];
   final[1] = current[1];
   final[2] = current[2];
      
   window.interval = setInterval(function(){
      if (final[0] < color[0]) final[0]++;
      else if (final[0] > color[0]) final[0]--;
      
      if (final[1] < color[1]) final[1]++;
      else if (final[1] > color[1]) final[1]--;
         
      if (final[2] < color[2]) final[2]++;
      else if (final[2] > color[2]) final[2]--;
         
      element.style.backgroundColor = "rgb(" + final.join(", ") + ")";
      
      if (final[0] == color[0] &&
          final[1] == color[1] &&
          final[2] == color[2])
         clearInterval(window.interval);
   }, 0.1);
}

var options = document.getElementsByTagName("input"),
    totalOpt = options.length, 
    aux = [] || new Array(),
    div = document.getElementsByTagName("div")[0];

for (var m = 0; m < totalOpt; m++){
   if (options[m].name == "color") aux.push(options[m]);
}
options = aux;

for (var j = 0, total = options.length; j < total; j++){
   (function(index){
      options[index].onclick = function(){
         change(this.value, div);
      };
   })(j);   
}