I have a javascript search engine i use on my website which i would like to change.

You can see a scaled down version at http://www.hostcompanies.com/searchhelp.htm

Problem is it only works when pressing the GO button.

I would rather it also worked by pressing the enter / return key on the keyboard.

Does anyone know how to alter this code to make it do that?

I am not really very good very javascript and the orginal code was written by a friend.