/* Force current frame to the top of the stack to prevent cross-frame-scripting (XFS) attack */

if (self == top) {
    document.documentElement.style.display = "block";
}
else {
    //The following condition is for Facebook app pages, where we need the iframe to work
    if (self.location.href.indexOf('_facebook.html') < 0) {
        top.location = self.location;
    }
}