function check_membership_type()
{
	frm = document.forms.registration_form
	container = document.getElementById('divPostSelectMembershipType');
	switch (frm.membership_type.options[frm.membership_type.selectedIndex].value)
	{
		case '15':
			document.getElementById('divHowManyBases').style.display = 'block';
			get_membership_cost();
			break;

		case '1':
			document.getElementById('divCollegeAndCounty').style.display = 'block';
			get_membership_cost();
			break;
		
		default:
			document.getElementById('divHowManyBases').style.display = 'none';
			document.getElementById('divCollegeAndCounty').style.display = 'none';
			get_membership_cost();
			break;

	
	}
}

var http_request = false;
function makePOSTRequest(url, parameters) {
  http_request = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari,...
	 http_request = new XMLHttpRequest();
	 if (http_request.overrideMimeType) {
		// set type accordingly to anticipated content type
		//http_request.overrideMimeType('text/xml');
		http_request.overrideMimeType('text/html');
	 }
  } else if (window.ActiveXObject) { // IE
	 try {
		http_request = new ActiveXObject("Msxml2.XMLHTTP");
	 } catch (e) {
		try {
		   http_request = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e) {}
	 }
  }
  if (!http_request) {
	 alert('Cannot create XMLHTTP instance');
	 return false;
  }
  
  http_request.onreadystatechange = showResult;
  http_request.open('POST', url, true);
  http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  http_request.setRequestHeader("Content-length", parameters.length);
  http_request.setRequestHeader("Connection", "close");
  http_request.send(parameters);
}

function showResult() {
  if (http_request.readyState == 4) {
	 if (http_request.status == 200) {
		//alert(http_request.responseText);
		result = http_request.responseText;
		document.getElementById('divPostSelectMembershipType').innerHTML = result;
		document.getElementById('divPostSelectMembershipType').style.display = 'block';
	 } else {
		alert('There was a problem with the request.');
	 }
  }
}

function get_membership_cost() 
{
	frm = document.forms.registration_form;
	var poststr = "membership_id=" + frm.membership_type.options[frm.membership_type.selectedIndex].value 
		+ "&bases=" + frm.how_many_bases.options[frm.how_many_bases.selectedIndex].value;
	makePOSTRequest('inc/get_membership_cost.php', poststr);
}

function showUsStatesDiv()
{
	document.getElementById('divUsStates').style.display = 'block';
}

function hideUsStatesDiv()
{
	document.getElementById('divUsStates').style.display = 'none';
}