function createNavButton() {
 var thePageHeader = document.getElementById('pageHeader_top');
 var theButton = document.createElement('div');
 theButton.setAttribute('id', 'navButton');
 theButton.addEventListener('click', toggleNavigation);
 thePageHeader.appendChild(theButton);
 document.getElementById('sidebar').className='hidden';
}

function toggleNavigation() {
	navigationDiv=document.getElementById('sidebar');
	if (navigationDiv.className=='hidden') {
		navigationDiv.className='overlay';
	}
	else {
		navigationDiv.className='hidden';
	}
}

if((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))) {
	addLoadEvent(createNavButton);
	}