Frique

var tabbableElements = 'a[href], area[href], input:not([disabled]),' +
	'select:not([disabled]), textarea:not([disabled]),' +
	'button:not([disabled]), iframe, object, embed, *[tabindex],' +
	'*[contenteditable]';

function keepFocus($context){
	var $allTabbableElements = $context.find(tabbableElements);
	var $firstTabbableElement = $allTabbableElements.first();
	var $lastTabbableElement = $allTabbableElements.last();
	$context.on('keydown', function(event){