Problems with my conditionals in single.php by category

Look at http://codex.wordpress.org/Function_Reference/in_category

Example:

<?php if ( in_category('rabbis-weekly-commentary') ) : ?>                   
<div id="inner_header">
<img src="http://www.ifcj.ca/ifcj_ca/images/elements/commentary_header.gif" border="0">
...
<?php elseif ( in_category('yaels-weekly-commentary') ) : ?>                    
<div id="inner_header">
<img src="http://www.ifcj.ca/ifcj_ca/images/elements/commentary_header.gif" border="0">

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