JavaScript upgrade from CRM 4.0 to CRM 2011 for "additionalparams"

Hi All,

I am working on some script upgrade from CRM 4.0 to CRM 2011. Here I need to upgrade some script which is failing in CRM 2011.

crmForm.all.new_partyid.additionalparams = 'search=' + searchValue;

I checked and found that this can be converted in below line.

Xrm.Page.getAttribute("mer_partyid").additionalparams = 'search=' + searchValue;

but above line does not return desired values.

Can anybody help me on this? Thanks in advance.