To disable right click:
Note1:The following script works for IE6 and Netscape.

Note2:Right click cannot be disabled for Opera browsers!

<script>

var isNS = (navigator.appName == "Netscape") ? 1 : 0;



if(navigator.appName == "Netscape")

document.captureEvents(Event.MOUSEDOWN||Event.MOUSEUP);



function mischandler(){

return false;

}



function mousehandler(e){

	var myevent = (isNS) ? e : event;

	var eventbutton = (isNS) ? myevent.which : myevent.button;

 if((eventbutton==2)||(eventbutton==3)) return false;

}

document.oncontextmenu = mischandler;

document.onmousedown = mousehandler;

document.onmouseup = mousehandler;