window.onload = function() {
  document.onselectstart = function() {return false;} // ie
  document.onmousedown = function() {return false;} // mozilla
}
window.onload = function() {
  var element = document.getElementById('sel_margin');
  element.onselectstart = function () { return false; } // ie
  element.onmousedown = function () { return false; } // mozilla
}

function noRightClick()
{ 
 if (event.button==2) 
     {
	  alert('© SINERGROUP')
	 } 
} 
document.onmousedown=noRightClick