link_to_remote question

I have the simple view page:

<div id="test1"></div> <%= link_to_remote "Turn on Alert", :url => {:controller => "alerts", :action => "new"} :update => "test1" %>

Then in my controller I simply do

if request.xhr?   render :text => "AJAX Called" else   redirect_to :back end

It's hitting the request.xhr? block as I had a logger.info statement there. However the "test1" div is not saying "AJAX Called". Nothing appears.

Help?

One thing I forgot to add, I have a nested div actually b/c my layout has a div. So the above is really

<div id="main"> <div id="test1"></div> </div>

Could this be the problem?