function mouseDown(e)
{
  var ctrlPressed=0;
  var altPressed=0;
  var shiftPressed=0;

  var message0="Copyright of all content and graphics on this site belongs to VIA, Inc. \nRe-use of any content and graphics without permission is strictly prohibited.";
  var message1="Please do not use this way to open new browser!";

  shiftPressed=event.shiftKey;
  altPressed  =event.altKey;
  ctrlPressed =event.ctrlKey;
/*
  self.status=""+
                  "shiftKey="+ event.shiftKey +
                  ", altKey="+ event.altKey +
                  ", ctrlKey="+ event.ctrlKey;
*/

// only left mouse button can use, all keys are disable
 if (shiftPressed || altPressed || ctrlPressed || event.button!=1 || event.keyCode !=0) {

	if (event.button==1 && shiftPressed) {
	  alert(message1);
	  return false;
	}

	if (event.button==2 || event.button==3) {
	  alert(message0);
	  return false;
	}

	event.keyCode=0;
	return false;
 }

  return true;

}

//鎖住上、左menu按右鍵看程式碼
//document.onmousedown = mouseDown;
//document.oncontextmenu = mouseDown;




// for enhancement use
//document.onkeydown   = mouseDown;
//document.onkeypress  = mouseDown;