function getDates()
{
	
	var course=document.getElementById('course').options[document.getElementById('course').selectedIndex].value;
	var country=document.getElementById('country').options[document.getElementById('country').selectedIndex].value;	
	var city=document.getElementById('city').options[document.getElementById('city').selectedIndex].value;
	//document.getElementById("city_td").innerHTML='';
		
	date_xmlHttp=DateGetXmlHttpObject()
	if (date_xmlHttp==null)
  	{
  		alert ("Your browser does not support AJAX!");
  		return;
  	} 
  
  		var url="../includes/ajax/get_dates.php";
		url=url+"?country="+country;
		url=url+"&course="+course;
		url=url+"&city="+city;
		url=url+"&sid="+Math.random();
		date_xmlHttp.onreadystatechange=DateStateChanged;
		date_xmlHttp.open("GET",url,true);
		date_xmlHttp.send(null);
 }//function 


 
function DateStateChanged() 
{ 
	if (date_xmlHttp.readyState==4)
	{ 
		var date_response=date_xmlHttp.responseText;
		if(date_response!=0)
		{
		//document.getElementById('course_div').style.visibility='visible';
		document.getElementById('adate_td').innerHTML='';
		document.getElementById('adate_td').innerHTML=date_response;		
		}
	}
}
 

function DateGetXmlHttpObject()
{
	var xmlHttp=null;
	try
	  {
	 	 // Firefox, Opera 8.0+, Safari
	  	xmlHttp=new XMLHttpRequest();
	  }
	catch (e)
	  {
		  // Internet Explorer
		  try
	    {
	    	xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
	    }
	  catch (e)
	    {
	   		 xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	    }
	  }
	return xmlHttp;
}