jQuery(function( $ ){

	// Add 'shrink' class to site header on scrolling
	$( document ).on('scroll', function(){

		if ( $(window).width() > 800 ) {

			if ( $( document ).scrollTop() > 0 ){
				$( '.site-header' ).addClass( 'shrink' );

			} else {
				$( '.site-header' ).removeClass( 'shrink' );
			}
		}

	});

	// Function to automatically add a top margin to the visible element below .site-header
	function addTopMargin() {
		var header_height = $( ".site-header" ).outerHeight();
		$( ".nav-primary" ).css( "margin-top", header_height + "px" );
	}

	// http://stackoverflow.com/a/1974797/778809
	// Bind to the resize event of the window object
	$(window).on("resize", function () {
		if ( $(window).width() > 800 ) {
			addTopMargin();
			// Invoke the resize event immediately
		}
	}).resize();

});