Portal Default Screen Value change in SRM7.0

Hi Experts,

We are working on SRM7.0. The clinet requirement is below

In Advance search screen "Serach for" default field value is "confirmation" . But in the drop down of "Search for" filed the values like Contarct, PO, Shopping cart etc.. are available.

The client would like to have "Shopping cart" as the default value in "Serach for" field instead of "confirmation" .

How can we achive this? Please guide me.

Thanks

Giri