As far as I know, all you need to do is, on the getURL thing, put the name of the page (e.g.: my_page) and then un-check the expression box, so that it appears in quotes in the actionscript, then put the target (e.g.: _main) and then un-check the expression box.
The script will look like this:
getURL( "my_page", "_main" );
If you try this and it doesn't work, or already have tried it then could you paste (or e-mail me) the html code that sets up your frames and the ActionScript code that you are using?
Ta,
=)
PetitPal.
p.s. My e-mail is petitpal@yahoo.com