Scrollbar clicking

I downloaded the scrollbar file and the code for mousewheel operation.

http://www.kirupa.com/developer/flash8/scrollbar.htm

The file working okay. The only problem for me is the mousewheel operation is only active if the movie is clicked once.

I thought I can have a code telling that “click left mouse button when a cursor is on the movieclip” then the mousewheel works without actual clicking. Unfortunatelly, my actionscript knowledge is very limited and i couldn’t able to find any answer in the forum.

is it possible? or any other ways to solve it?

thanks.