Nearly there but still not working!

[silvermerc]

 <div><input type="hidden" name="gamertag" value="$post[field5]"> 
  <if condition="$post[field5]">
   <a onmouseover="showgamercard('$post[field5]');" onmouseout="return hidegamercard();" href="http://live.xbox.com/member/$post[field5]" target="_blank" rel="nofollow">$post[field5]</a></if></div>
</fieldset>
<fieldset><legend>My Info</legend>

Im wanting the bit where it was showgamercard postfield5 the on 3rd line to show this;
/images/legacy/gf_xbox.gif
How would i do that
Ross