I can't get my RSS News Feed to work. It was working at one time. Can someone please help. Here's the code on my site:

<tr vAlign="top">
<td bgColor="#f1f1f1" width="25">&nbsp;</td>
<td bgColor="#f1f1f1" colspan="3" height="100%"><!-- RSS FEED HERE -->

<marquee id="scroller" onmouseover="this.stop();" onmouseout="this.start();" scrollamount=1 direction=up width="100%" height="95%">
<?php

$insideitem = false;
$tag = "";
$title = "";
$description = "";
$link = "";

function startElement($parser, $name, $attrs) {
global $insideitem, $tag, $title, $description, $link;
if ($insideitem) {
$tag = $name;
} elseif ($name == "ITEM") {
$insideitem = true;
}
}

function endElement($parser, $name) {
global $insideitem, $tag, $title, $description, $link;
if ($name == "ITEM") {
printf("<div class='content'><a href='%s' class='news_link' target='news'>%s</a></div><br>",
trim($link),htmlspecialchars(trim($title)));

$title = "";
$description = "";
$link = "";
$insideitem = false;
}
}

function characterData($parser, $data) {
global $insideitem, $tag, $title, $description, $link;
if ($insideitem) {
switch ($tag) {
case "TITLE":
$title .= $data;
break;
case "DESCRIPTION":
$description .= $data;
break;
case "LINK":
$link .= $data;
break;
}
}
}

$xml_parser = xml_parser_create();
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "characterData");
$fp = fopen("http://www.securityfocus.com/rss/news.xml","r")
or die("Error reading RSS data.");
while ($data = fread($fp, 4096))
xml_parse($xml_parser, $data, feof($fp))
or die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($xml_parser)),
xml_get_current_line_number($xml_parser)));
fclose($fp);
xml_parser_free($xml_parser);

?>
</marquee>
</td>
</tr>
<tr valign="middle">
<td bgColor="#f1f1f1" width="10">&nbsp;</td>
<td bgcolor="#f1f1f1" width="100%" valign="middle" align="right" colspan="3">
<div class="news_source">News From SecurityFocus.com</div>
<!-- <div class="more_links">more&nbsp;&gt;&gt;&gt;</div> -->
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- END TABLE FOR THE CONTENT -->
<br>