function addMenu(width) {
	width = jQuery(document).width();
	if (width < 500) {
		$('ul#fullnav').hide();
		$('#mobilenav').show();
		$('#mobilenav').replaceWith('<div id="mobilenav"><form action="../"><select id="mobile-menu" onchange="var l=this.value;this.selectedIndex=0;location=l;")"><option>Menu</option><option value="http://t293.it/artists" >Artists</option><option value="http://t293.it/exhibitions" >Exhibitions</option><option value="http://t293.it/news" >News</option><option value="http://t293.it/library" >Library</option><option value="http://t293.it/info" >Info</option></select></form></div>');
	}
	if (width > 500) {
		$('ul#fullnav').show();
		$('#mobilenav').hide();
	}
}
$(function() {
    addMenu($(this).width());
    $(window).resize(function() {
        addMenu($(this).width());
    });
});