list product by brand using blocklayered

[hidetsugu]

Hi, 

I am using PS 1.6.1.24 and the theme i'm using didin't have a way to sort products on list page by brand, and it was something i really wanted. So i investigate module blocklayered and i was able to implement just the brand dropdown from this module into my page, but it's not working 100%. 

It works perfectly when i select one brand, but when i select a new brand, both brands are still selected as shown in title of the page, and in product count. Every time you select a new brand, the first one is still selected. I tried messing around with blocklayered.js, but still with no luck. 

Can someone help me solving this, in order to list only one brand at a time?

In case you want to check the issue happening, here is the link.

Thank You