Enable Right-Click in Websites that disable it

well some websites disable right click so when you right-click it says .....right-click not autorised...
HOW TO REMOVE IT?
it's very simple i just knew tht is was a JAVASCRIPT....so u have to disable javascript from your browser

IE6 or 7 not sure about other version...
Go to Tools ----> Internet Option
then choose "Security tab" click custom level...and find Scripting section..and disable "Active Scripting"....

For firefox...

GO TO tools ---> Options then click web features..
now unselect "enable javascript"

and dnt forget to put them back after u r done with the site.........