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IE6 & IE7 problem xhrGet

I've got a problem with the dojo xhrGet object. I try to make a function from the dojo examples and it is working on firefox and the other browsers except ie6 and ie7. If I want to see the page it says a javascript error (Requested element is not an object, or something) and the two div element not appears. Here is the code:

var ajaxLoader = function(aid,aurl){
    var contentNode = dojo.byId(aid);
    dojo.xhrGet({
        url: aurl,
        handleAs: "text",
        load: function(data,args){
            dojo.fadeOut({
                node: contentNode,
                onEnd: function(){
                  contentNode.innerHTML = data,
                  dojo.fadeIn({node: contentNode}).play()
                }
            }).play();
        },

        error: function(error,args){
            console.warn("error!",error);
        }
    })
}

I try a lot of things but still not working.
Sorry my bad english :)