chnaging eprop icon Options

[miix-tape]

i used this code to change the image for the eprop icon

<!-- begin code provided by createblog.com --><br /><script language=javascript><br />var oldprop = new Array('http://www.xanga.com/Images/eProp.gif');<br />var newprop = new<br />Array('URL OF NEW EPROP IMAGE HERE');<br />for (var i = 0; i < document.images.length; i++) {<br />for (var s = 0; s < oldprop.length; s++){<br />if (document.images[i].src == oldprop[s]){<br />neweprop = document.createElement('img');<br />neweprop.src = newprop[s];<br />document.images[i].parentNode.replaceChild(neweprop, document.images[i]);<br />break;<br />}<br />}<br />}<br /></script><br /><!-- end code provided by createblog.com -->

when i got it it said to put it in your custom header, i did that, & placed it right under my layout code, but it still dint work. why isnt this working for me?