Ahh, I just reread your first post. I see what you're doing.
The following should go in the actions panel on whatever frame that the button. Again, on the timeline not on the actual movieclip.
Code:
instance_cross.onRelease = function() {
getURL("http://www.ednadesigns.com/crosses.htm");
}
If you want to add the action on the actual movieclip, click on the movieclip then open the actions panel and add this:
Code:
on(release) {
getURL("site.com");
}
I don't recommend the second way because it gets really difficult to troubleshoot should something not work. If all AS is one place, it makes it easier. BOTH will work though and do the same thing
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