Keyword Search Functionality in CRM WEBUI

Hi Experts,

I am working in CRM 7.0 WEBUI. I have a requirement where i need a Keyword search functionality.In the sense, for suppose i have all names starting with A , B and C as my values for field( can be drop down values). now when i type A on that field then i should be able to see only the Names which start with A as drop down values.

I am not sure how can i achieve this functionality in WEBUI.

Please let me know your inputs.

Thanks & Regards,

Warun