Simple function to return object or iframe code, based on HTTP_ACCEPT

iframe_builder.php

<?php
if ( stristr($_SERVER["HTTP_ACCEPT"],"application/xhtml+xml") ) {
  header("Content-type: application/xhtml+xml");
}
else {
  header("Content-type: text/html");
}

function iFrameBuild($id,$src)
{
        if ( stristr($_SERVER["HTTP_ACCEPT"],"application/xhtml+xml") ) 
        {
                return '<object id="'.$id.'iFrame" standby="Loading '.$id.' iFrame" data="'.$src.'" type="text/html" style="border: 0 none; overflow: none; width: 700px; height: 200px; background-color: #111111;">'.$id.' is not a valid object target</object>';
        }
        else 
        {
                return '<iframe id="'.$id.'iFrame" src="'.$src.'" type="text/html" style="border: 0px 0px 0px 0px none; overflow: none; width: 700px; height: 200px; background-color: #111111;">No iFrame-support</iframe>';
        }
}
?>