var isNS = (navigator.appName == "Netscape") ? 1 : 0;
var EnableRightClick = 0;
if(isNS) 
document.captureEvents(Event.MOUSEDOWN||Event.MOUSEUP);
function mischandler(){
  if(EnableRightClick==1){ return true; }
  else {return false; }
}
function mousehandler(e){
  if(EnableRightClick==1){ return true; }
  var myevent = (isNS) ? e : event;
  var eventbutton = (isNS) ? myevent.which : myevent.button;
  if((eventbutton==2)||(eventbutton==3)) return false;
}
function keyhandler(e) {
  var myevent = (isNS) ? e : window.event;
  if (myevent.keyCode==96)
    EnableRightClick = 1;
  return;
}
document.oncontextmenu = mischandler;
document.onkeypress = keyhandler;
document.onmousedown = mousehandler;
document.onmouseup = mousehandler;

	//**************************************
	// ****************************
	// Block backspace onKeyDown************
	// ***************************


    	 function onKeyDown() {
    	 	if ( (event.altKey) || ((event.keyCode == 8) && 
    	 			(event.srcElement.type != "text" &&
    	 			event.srcElement.type != "textarea" &&
    	 			event.srcElement.type != "password")) || 
    	 			((event.ctrlKey) && ((event.keyCode == 78) || (event.keyCode == 82)) ) ||
    	
    	


        	 			(event.keyCode == 116) ) {
        	 		event.keyCode = 0;
        	 		event.returnValue = false;
        	 	}
        	 }