Question on Javascript Pan not Working

[fend0009]

Hi all:

I encountered a problem in constructing my interactive map. The navigation
(pan) buttons do not work. 

The JavaScript Console returned the following error message

Error: document.mapserv.submit is not a function
Source File:
http://maps.socsci.umn.edu/cgi-bin/mapserv?map=/home/fend0009/public_html/noise.map
Line: 81 

Could someone please give me some guidance? I appreciate your time.

Regards,
Jessica Fendos