I want to use a drop down list. where i want that when i click on this drop down and item shud be selected on typing the word.
say if ther are month names populated in drop down..
n wen i type as j ..u..l then it shud go to the july...n wen i type as j..u..n then it shud go to the june.
 some body tell me how i can do like this .
 i ve done this kind of functionality with the list box using the javascript functions.but not getting how to do with the dropdown.

I dont think you need to do much for that..

on selection of the dropdown you just type the letters and you go there...that is what people normally do in webpages containing dropdowns esp. month dropdown

Regards
Ganesh