javascript focus question

I've been trying to get a little javascript function going for matt to add to the forums that would allow tags to be automaticly populated in the form.

the link to that thread is here:
http://codewalkers.com/forum/index.php?action=displaythread&forum=sitesupport&id=423&realm=default

but the problem is simply why the focus() will set to the end of the text field if I have already been typing and add a tag but not if I add a tag as my first action.

you can see a test of this here:
www.azwc.com/cw/javascripttest3.html

My method to solve the focus on end of text was to count the length of the field and place that variable in the focus(cnt) parameters area though I was unable to find a reference online that showed me if this was a valid parameter of that method, it does seem to work.

actually the count doesn't seem to have anything to do with it as far as I can tell.

nevermind I got it:

www.azwc.com/cw/javascripttest2.html