Mantra Theme Javascript mouseover not working

I’m using Mantra Theme and have added some custom javasript to do a simple image replacement on mouseover. The code works fine outside of WordPress but when added as custom javascript to the Mantra theme nothing happens. Can someone point me in the right direction.

Javascript:

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

html:

</a><a href="contact"><img src="http://taylorwellsinsurance.com/wp-content/uploads/2013/09/InfoButton5.gif" alt="Physicians Liability Insurance Information from Taylor Wells Insurance" name="Image3" width="142" height="48"  id="Image3" class="aligncenter size-full wp-image-92"/>

[Moderator Note: Please post code & markup between backticks or use the code button. Your posted code has now been permanently damaged by the forum’s parser.]

Thanks,
Michele