making product links absolute

can i make the products links ABSOLUTE?

on search.php line 193

$searchresults["products"][$k]["productHREF"] = "product/".urlencode(tapestry_hyphenate($product["name"])).".html";

i have a new line on my config.php

$config_domainurl = "http://example.com";

but inserting a $config_domainurl before the

$searchresults["products"][$k]["productHREF"] = "$config_domainurl/product/".urlencode(tapestry_hyphenate($product["name"])).".html";

only gives me an output of

http://example.com/http://example.com/product/product_name.html

i want the output to be

http://example.com/product/product_name.html

pardon my many questions, i can barely program PHP :)

thank you.

atman