function click(e) {
 if (document.all) {
  if (event.button==1||event.button==2||event.button==3) {
	oncontextmenu='return false';
	onselectstart='return false';
	ondragstart='return false';
  }
 }
 
}

document.onmousedown=click;
document.oncontextmenu = new Function("return false;")
document.onselectstart = new Function("return false;")
document.ondragstart = new Function("return false;")