How can I let the href have no popmenu?

function avoidRightClick()
{
     if (event.button==2||event.button==3)
     {
     alert('no right button allowed');
     return false;
     }
}
document.onmousedown=avoidRightClick;

this should do it for what concerns the menu not to appear when you right click (obviously customise it where I have put the alert()).
Re the second questions, you mean that in certain pages you want a custom menu to appear instead of the normal one when you right click on a link?

Thank you for your answer! Your method is right, But I don't want popup anythig include the warning message box.

the second questions, what you say is right. I want a custom menu to appear instead of the normal one when I right click on a link!

thanks!

Thanks very much!
now it worked correctly!