Problems with Double Quotes and highlight_string

PHP,
                I have this code:
 
function highlight_code ($langName, $codeText)
    {
        $langName = strtolower($langName);
                require_once
XOOPS_ROOT_PATH."/colorcode/HColor_Core.php";
                if ($langName == 'php'){
                    return highlight_string("<?$codeText?".">", TRUE);
                }else{
                    $HColor = new HColorCore;
                    return $HColor->HighlightColor($langName,$codeText);
                }
    }
 
That will be ran to highlight the PHP syntax in a forum post.
Everything works fine if there are no double quotes in the form post but
if there are double quotes in the post, I get improper markup of the PHP
code being posted in the forum post.  Can someone help me out?  Thanks,
 
Jeremy Whitlock --- MCP/MCSA
IT Manager for Star Precision, Inc.
Phone:  (970) 535-4795
Metro:  (303) 926-0559
Fax:  (970) 535-0780
Metro Fax:  (303) 926-0559
http://www.starprecision.com