function nav() {
	/* Resizes and repositions to main navigation as necessary */
	
	// Reset
	$('#nav_background').css('width', 'auto').css('height', 'auto').css('margin-top', 'auto');
	$('nav ul').css('margin-top', 'auto');
	
	if($(document).width() > 767) {
		// Set the width & height of the nav_background element
		var width = $('nav ul').width();
		var height = ($('nav ul li a').css('font-size').replace('px', ''))*2;
	
		$('#nav_background').width(width).height(height);
	
		// Now reposition the nav ul to be inside nav_background, and move nav_background down
		$('nav ul').css('margin-top', -(($('nav ul li a').css('font-size').replace('px', ''))*2));
	
		var m_top = $('header#masthead h1 img').height()-height;
		$('#nav_background').css('margin-top', m_top);
	} //if
} //nav()

// Add events
addEvent(window, 'load', nav);

addEvent(window, 'resize', nav);