The use of frames at a Web site allows you to view two or more Web pages simultaneously in one Web browser window. This ability is put their by the Webmaster of the site.
Frames can be very convenient for navigating complex Web sites.
But when viewing sites that use frames, you should be ware of how to use them in a Web browser. They add some extra steps to some common tasks. The way frames are implemented here is, the menu is in the left frame, and the desired Web page appears in the right frame. Put the cursor over the divider between the two frames and the cursor will change to left and right pointing arrows. Click and drag the divider to resize the menu frame appropriate to see all the menu items.