Web sites disable the right click function of the mouse button because you don't steal (via right-click->save picture) their photos or images etc....

It's easy to change, assuming your using IE :
Click Tools->"Internet Options"
Click the security tab
Click Custom Level
Scroll down to the Scripting section
Set Active Scripting to disable
Click "Ok" ... thats it....


Again u can enable it..because some sites require javascript to view it..............