You already are... the variable is passed into "getid", and then subsequently into "rowid". I don't know what "menu" you're passing it into. I see a "window.open" command, is your menu a page in a new window? Then simply include your "getid" variable as a querystring parameter in the URL for the new window.

The new window can also refer to variables in the parent window using the "self.parent.getid" syntax.

Your scripts are a bit sloppy: some missing semi-colons, and also, it's good practice to enclose procedure bodies in curly-braces (including your if/else conditional statements).