if (window.Event) 
  document.captureEvents(Event.MOUSEUP); 
  function nocontextmenu() 
  {
  event.cancelBubble = true
  event.returnValue = false;
  return false;
  }
  function norightclick(e) 
  {
  if (window.Event) 
  {
  if (e.which == 2 || e.which == 3)
  return false;
  }
  else
  if (event.button == 2 || event.button == 3)
 {
 event.cancelBubble = true
 event.returnValue = false;
 return false;
 }
 }
 document.oncontextmenu = nocontextmenu; //对ie5.0以上
 document.onmousedown = norightclick; //对其它浏览器


function pggo(){
		if(isNaN(pageform.pg.value)==false){
			pageform.submit();
		}else{
			alert("请输入正确的页数！");
		}
	}