[TYPO3] macina_searchbox extention custemization

[rocky]

Hey

I've installed macina_searchbox extention and it functions ok. But I do 
not know how to customize the following:

Instead of a submit button I saw a graphic icon at the screen shot 
section of the online manual. I want to have the same feature How can I 
do that? Right now it shows a submit button not a graphic button on my 
local machine.
I want to put a graphic preceding the text input field. Do I need to 
alter the template html or can I twik some PHP file?

If you could give me any hints, I would really appreciate it?

Rocky