title: jquery - change image src with .replace
body: <p>I've got some images that I want to change to another image when I hover over a div. Image 1: "geluid1", image 2: "geluid2".</p>
  
  <pre><code>$(".block").mouseover(function(){
    $("img",this).attr("src").replace("1","2");
  });
  </code></pre>
  
  <p>But for some reason this doesn't seem to work properly. Can someone help me find the problem?</p>