hyperlink naming

hey all… i have 1 script which has similarities forums but more like urbandictionary…

anyway i need some codes to name hypelinks automatically which are added by users. shortly, i want the script to show it in texts as

“example” ==> it must redirect me to a website when i click on it… (this is only example word, it must depend according to the writings of users)

instead of:

http://www.awebsite.com

the codes which the script already includes about hyperlink:

[php]if ($string)
$mesaj = preg_replace("’$string’Ui","$string",$mesaj);

$mesaj = preg_replace("’(http://(.*))'Ui","<a target=blank_ href=“http\3://\1”>http\3://\1",$mesaj);[/php]

and about link button which is located next to text box (opens another input box):

<input type="button" class="but" onclick="var a=prompt('<?=$language[link_adress]?>', 'http://');if(a.length>0&&a!='<?=$language[link]?>: http://')hen('d', '(' + a + '', ')', '');" value="http://" title="link" />
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