Assuming you're using Internet Explorer, just go view->Toolbars->Standard Buttons and everything should return. You can then modify what's there by right-clicking that toolbar and selecting Customize.
Hope this helps,
The arrow that takes you back to the previous screen and the forward arrow have dissapeared. How do I get them back. Probably simple but I can't figure it out. Please help. It also has the refresh, home and ect on this toolbar.