Transitions in Dreamweaver

Hi

I am working on an html-webbanner, and would like the call-to-action button to tone in via a transition.

I have gotten it to work when you hover the mouse over. BUT I just want it to do it without any action from the user.

I have tried to choose transition on: active in stead of hover, but its not working.

My CSS-code is looking like this:

#button {

width: 320,px;

text-align: center;

opacity: 0;

-webkit-transition: all 2s ease-in-out 0s;

-o-transition: all 2s ease-in-out 0s;

transition: all 2s ease-in-out 0s;

}

#button:hover {

-webkit-opacity: 0;

opacity: 1;

}

Can anyone help me?

Thanks a lot in advance,

Ea