targeting frames

I have designed a website that uses three html frames, labeled _top, _main and _bottom. My java action script is all containbed in the top frame and I am trying to use the getURL function so that when my buttons in the top frame are clicked the relevent page is displayed in the main frame.

The script workds but i can't get the new page to be displayed in the _main frame. For some reason the selected page opens up as if it was set to target _self. How do I target the _main frame?

[498 byte] By [chrism2050a] at [2007-11-26 18:03:18]