[kh99]

So if I understand correctly, you want to modify some javascript that currently display "Welcome to the blah blah" to display "Welcome, member" like the vbulletin welcome message? Probably what you want to do is edit a template to insert some code that defines a javascript string variable with the message you want to display. You can steal the phrase out of the header template and use something like this:

<script type="text/javascript">
var welcome_message = '{vb:rawphrase welcome_x_link_y, {vb:raw bbuserinfo.username}, {vb:link member, {vb:raw bbuserinfo}}}';
</script>

then of course in the javascript you'd use welcome_message where you want the message.