Sticky menu on scroll

sticky_menu.js

// Create a clone of the menu, right next to original.
$('.top_fixed_menu').addClass('original').clone().insertAfter('.top_fixed_menu').addClass('cloned').css('position','fixed').css('top','0').css('margin-top','0').css('z-index','500').removeClass('original').hide();

scrollIntervalID = setInterval(stickIt, 10);
function stickIt() {
	var orgElementPos = $('.original').offset();
	orgElementTop = orgElementPos.top;               

	if ($(window).scrollTop() >= (orgElementTop)) {
		// scrolled past the original position; now only show the cloned, sticky element.

		// Cloned element should always have same left position and width as original element.     
		orgElement = $('.original');
		coordsOrgElement = orgElement.offset();
		leftOrgElement = coordsOrgElement.left;  
		widthOrgElement = orgElement.css('width');
		$('.cloned').css('left',leftOrgElement+'px').css('top',0).css('width',widthOrgElement).show();
		$('.original').css('visibility','hidden');
	} else {
		// not scrolled past the menu; only show the original menu.
		$('.cloned').hide();
		$('.original').css('visibility','visible');
	}
}