Just to give you another option, here's another version (a little different) you could try out:
Accomplishes essentially the same purpose, perhaps a little easier to work with .
destination = new Array ("","national.html","franklinh.html","ham1.html","northh.html","otara.html","papat.html","tga_h.html");
if (pick != 0)
location.href = destination[pick];
<option>Select a Region</option>