preg_replace help

Hello everyone i am writing a snippet for replacing the keywords into links.
It almost works but it also replaces the words in between HTML Tags
So can anyone help me in fixing that

[CODE]<?php
$textlinksname = ‘Google’;
$textlinksurl = ‘http://google.com’;
$body = ‘Google is a great search engine. Here is the logo of it <img src =’http://www.google.co.in/google/images/srpr/logo1w.png’/>’;

$replace = “<a href='”.$textlinksurl.”‘ target=’_blank’>”.$textlinksname.”</a>”;
$body = preg_replace(‘~(?<!http://|www.|/)’.$textlinksname.’~i’, $replace,$body,200);

echo $body;
?>[/CODE]

It outputs as

[code]
<a href=’http://google.com’ target=’_blank’>Google</a> is a great search engine. Here is the logo of it
<img src =’http://www.google.co.in/google/intl/en_com/images/srpr/google-123-<a href=’http://google.com’ target=’_blank’>Google</a>.png’/>
[/code]

But i need output like this such that it wont mess with HTML Tags

[code]
<a href=’http://google.com’ target=’_blank’>Google</a> is a great search engine. Here is the logo of it
<img src =’http://www.google.co.in/google/intl/en_com/images/srpr/google-123-Google.png’/>
[/code]

Can anyone help me on how to prevent that???

Thanks in advance ?

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