function ajaxHeader(){
	var ajaxRequest;  
	
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				// Something went wrong
				alert("Your browser broke!");
				return false;
			}
		}
	}
     return ajaxRequest;
}
	

function getDistricts(region)
{
  ajaxRequest = ajaxHeader();
    
  ajaxRequest.onreadystatechange = function(){
    var span = document.getElementById('districtSpan');
    if(ajaxRequest.readyState == 4){
	  span.innerHTML = ajaxRequest.responseText;
    }
	else
	{
	  span.innerHTML = "Updating Districts";
	}
  }
  
  var parameters = "region=" + region;
  	
  ajaxRequest.open("POST", "/content/sidebars/vianet/districts.php", true)
  ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded")
  ajaxRequest.send(parameters)
}