障蔽右键（javascript）兼容ie，firefox

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; // for IE5+
document.onmousedown = norightclick; // for all others?? http://www.my400800.cn