Movie clip as button

i have a movie clip which i wanted to act as a button

the movie clip has actually 2 images

and when u put the mouse over it, it fades and another image shows

i’ve tried to make it act as a button trying to load a movie but it doesnt work

but when i make it just a button with no effect the movie loads

how can i make it so that it has both the effect and acts like a button?