Flash 8 String replace issues

programming flash
1

I am trying something that seems pretty simple, but i’m stuck.
What I am trying to do is take a string that says “play: watch preview” and make it say only “watch preview”

if (showButton02.indexOf ("play:") !=1){
        showButton02.replace("play:", "");
        trace("HERE IS THE STRING WITHOUT PLAY!"+showButton02);

Any help would be appreciated!