Sticky Header On Scroll

/**
	 * Sticky header
	 */
	if ( $body.hasClass( 'header-sticky' ) )
	{
		var $topbar = $( '#topbar' ),
			offset = $topbar.length ? $topbar.height() : 0;

		$window.scroll( function()
		{	//alert(offset);
      $header = $( '#header' ),
			if ( $window.scrollTop() >= 60 )
				$header.addClass( 'sticky' );
			else
				$header.removeClass( 'sticky' );
		} );
	}