function cancelMouseClick(e){
  return false;
 }
function onload_cancelMouseClick(e){

 allImages = document.getElementsByTagName('img');

 for(var i=0; i<allImages.length;i++){
  if(allImages[i]!=undefined){
		allImages[i].oncontextmenu= cancelMouseClick;
		allImages[i].onmousedown= cancelMouseClick;
		allImages[i].onmouseup= cancelMouseClick;
	}
 }
}
window.onload = onload_cancelMouseClick;