How to set default entity type (Look For in Lookup Dialog) for Lookup dialog in CRM 2013?

Hi,

I tried below code to set Look For(Default entity type) for Lookup window in CRM 2013 On-premise.

document.getElementById("lookUpAttributeName").setAttribute("defaulttype","2");

But the above code does not work.

Can anyone help me to set the default entity type for Lookup dialog in CRM 2013.