function switchNav(div) {
	var option=['1','2','3','4','5','6','7','8','9','10','11'];
	for (var i=0; i<option.length; i++) {
		if (document.getElementById(option[i])) {
			obj=document.getElementById(option[i]);
			obj.style.display=(option[i]==div)? "block" : "none";
		}
	}
}

function hideNav(div) {
	var option=['1','2','3','4','5','6','7','8','9','10','11'];
	for (var i=0; i<option.length; i++) {
		if (document.getElementById(option[i])) {
			obj=document.getElementById(option[i]);
			obj.style.display=(option[i]==div)? "none" : "none";
		}
	}
}

function confirmSubmit() {
	var agree=confirm("Are you sure you wish to continue? This action cannot be reversed.");
	if (agree)
		return true ;
	else
		return false ;
}