JavaScript/jQuery: Detect if content is inside iframe

detectFrame.js

function detectFrame() {
	if (window.frameElement) {
		// in frame
		alert('framed: YES');
		$('body').addClass('framed');
	} else {
		// not in frame
		alert('framed: NO');
		$('body').removeClass('framed');
	}
}

$(window).load(function() {
	detectFrame();
});