links outside root directory

hi guys,... 

how can I link outside root directory? 

 <?php echo $html->link($dba['Dba']['name'], $dba['Dba']['url']) ?>

this output with a root, in a view: 

<a href="/dbas/http:www.some_domain">Here is test</a>

but I want it to be: 

<a href="http:www.some_domain">Here is test</a>

thanks in advance

chris

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