Button loading html in frame

I can’t for the life of me get this to work. I have my flash publish settings in CS3 set to AS2.

I am simply just trying to get buttons on a menu to load html pages into a specified frame.

I am using this AS on the button

on (release) {
getURL(“bottom2.html”, mainframe);
}

My HTML is correct… but the button loads the html page into a new page instead of the frame ‘mainframe’. This must be a simple setting or code that I am missing…it half works! I am pressed on time with this if anyone can offer some guidance.