PHP Code:
<a href="javascript:window.open('two.html','[b]two[/b]');window.open('three.html','[b]three[/b]');void(1)">click</a>
Just change "two" and "three" to the correct frame names and there shouldn't be a space in "javascript", it seems like it's the board script that does that.
What it will do is load two.html in the frame with name "two" and three.html in the frame with name "three".