Bonus Tag could urls

This patch gets the tag cloud module working.
URLs were being written out as http:///56
I'm not sure if its proper form. I tried using the $base_path variable, but it wasn't reliable.
This is my first patch.

This is the change:

function theme_vbtg_weighted($terms, $url) {

to

function theme_vbtg_weighted($terms, $url) {
	$url = "taxonomy/term";