[JavaScript] 如何自定义更改鼠标右键...

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>鼠标右键更换</title>

<style type="text/css">

</style>

<SCRIPT LANGUAGE="JavaScript">
// RightClickMenu

function showmenuie5(){
  var rightedge=document.body.clientWidth-event.clientX
  var bottomedge=document.body.clientHeight-event.clientY
  if (rightedge<ie5menu.offsetWidth)
   ie5menu.style.left=document.body.scrollLeft+event.clientX-ie5menu.offsetWidth
  else
   ie5menu.style.left=document.body.scrollLeft+event.clientX
  if (bottomedge<ie5menu.offsetHeight)
   ie5menu.style.top=document.body.scrollTop+event.clientY-ie5menu.offsetHeight
  else
   ie5menu.style.top=document.body.scrollTop+event.clientY
  ie5menu.style.visibility="visible"
  return false
}
function hidemenuie5(){
  ie5menu.style.visibility="hidden"
}
function highlightie5(){
  if (event.srcElement.className=="menuitems"){
   event.srcElement.style.backgroundColor="highlight"
   event.srcElement.style.color="white"
  }
}
function lowlightie5(){
  if (event.srcElement.className=="menuitems"){
   event.srcElement.style.backgroundColor=""
   event.srcElement.style.color="black"
  }
}
function jumptoie5(){
  if (event.srcElement.className=="menuitems"){
   if (event.srcElement.url != ''){
    if (event.srcElement.getAttribute("target")!=null)
     window.open(event.srcElement.url,event.srcElement.getAttribute("target"))
    else
     window.location=event.srcElement.url
   }
  }
}

</SCRIPT>
</head>
<body>

<RightClick>

<script language="JavaScript">

</script>
</RightClick>

</body>
</html>