Forums Scripts & Popups channel popup

I got this script that gives a custom channel popup menu.
only problem is it doesn't work on rclick because i dont know howto link the alias to the rclick.
the alias is like this:
alias popup_test {
But how do i link that to rclick?
something like:
if ( ........ == rclick) { popup_test }

please help me....

Greetzz