get only specific data in success message from ajax

i have an ajax call and i am getting a response from the call. the code is like this:

<div id="flow_#id#~#sid#" style="margin: 0 10px 0 0;float:right;height:150px;"  class="code"> 
                <img src="/assets/codes/#code#.jpg" style="max-height: 230px;">
            </div>

What i am doing is the response i get from my ajax, i want to replace the contents of the div tag with the value coming from my ajax success

ajax call is like this

$.ajax({
            url: 'bc.cfm?ID=' + getID + '&ssID=' + getSID,
            type: "GET",
            cache: false,
            success: function(data){
                $("#flow_" + getID + "~" + getSID + " img:last-child").remove();
                $("#flow_" + getID + "~" + getSID).html(data);
            }
        });

But a complete html page is coming in success, i can the img in firebug, but a complete html source is there, how can i extract that img tag and replace with the one which is already there above [the id is going to be same for both for identification, only 1 will be used, we will be removing and adding again]