Filling in Form onclick of menu item. (please help)

[LAGarcia]

I am trying to fill in a form field on the click of one of my menu items.

I have...
function AddText (source, formfld) {
formfld.value += source.innerText + "\n";
}
Which will fill in the form but can seem to figure out where to put everything and how to call it. Is this possible?

Thanks.