Hiding the page in a URL

[Shen Ku]

Hi there

I have noticed lately that alot of web sites hide the actual page name and post values. How do they do this? I assume its maybe javascript? I want to do something similar but dont want to make any major changes or affect site performance.

Does any one have any ideas?

Thanks
:D

[the tree]

POST values (unlike GET values) never appear in the URL.