Try
this code from Eileen to replace the Upcoming Shows header with your own image. Then use this code to replace the Comments header with your own image (it should stretch out to fill the page):
CODE
<style>
.friendscomments {position:relative; left:0px!important;}
.friendscomments {width:800px!important;}
.friendscomments td, .friendscomments table {width:100%!important}
.friendscomments table table td {width:auto!important;}
.friendsComments tbody tr td.text table tbody tr td span.orangetext15 {background-image:url(http://www.danieldare.com/tfoa/myspace/tfoafriendscomments.jpg); background-repeat:no-repeat; background-color:transparent; display:block!important; height:103px; width:800px; overflow:hidden; border:0px; font-size:1px; color:000000; text-align:center; line-height:5px;}
</style>
Replace the underlined URL with the url of the image you want to use.