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//右键开始
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

//禁止选择文本
var omitformtags = ["input", "textarea", "select"]
omitformtags = omitformtags.join("|")
function disableselect(e) {
    if (omitformtags.indexOf(e.target.tagName.toLowerCase()) == -1)
        return false
}
function reEnable() {
    return true
}
if (typeof document.onselectstart != "undefined")
    document.onselectstart = new Function("return false")
else {
    document.onmousedown = disableselect
    document.onmouseup = reEnable
}