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;}
}
//禁右键
document.oncontextmenu = nocontextmenu;   // for IE5+
document.onmousedown = norightclick;   // for all others