//disable right click

document.onmousedown=disableclick;
 
  function disableclick(event)
  {
    if(event.button==2)
     {
       alert("right click disabled");
       return false;    
     }
  };
 
 //disable f12 key
  
  document.onkeypress = function (event) {
	  event = (event || window.event); if (event.keyCode == 123) {
		  alert('No F-12'); 
		  return false; 
		  } };
  document.onmousedown = function (event) {
	  event = (event || window.event); if (event.keyCode == 123) {
		  alert('No F-keys'); 
		  return false;
		  } };
  document.onkeydown = function (event) { 
	  event = (event || window.event); if (event.keyCode == 123) { 
		  alert('No F-keys');
		  return false; 
		  } };