If you're using a JavaScript enabled version of Netscape Navigator, you can use it instead of your calculator to perform even very complex calculations. No, you don't have to go to a web site with an online calculator to do this. All you have to do is:

Press CTRL+L or go to the "Location" input box
Type javascript:eval( <your formula> ) and press ENTER

For example, to add 1 and 3 type:

javascript:eval( 1 + 3 )

and press ENTER
Of course, if you have Netscape handy, you probably have dozen other software programs on your computer that's able to perform simple calculations. Well, it's the thought that counts!