Fix problem parameter in url

Project Budget (USD)

Project Description:
Hi, i have other job for you
I would like fix small problem with parameter in url for google analytics

I explain :
Check this link :
> All is ok

but with this link :

function php delete parameter, it's function subst() ...
I know the file who create problem and i need expert for check and change function rewriting

CAn you make this ?

Skills required:
jQuery / Prototype
Project offered by: