var request = GXmlHttp.create();

function getColumn1Data()
{
	var params2='listingGetData.php?state=VA';
	request.open("GET", params2, true); 
	request.onreadystatechange = function() {
      if (request.readyState == 4) { 
	      		  document.getElementById('column1').innerHTML = request.responseText;
				  getColumn2Data();
		                           }//nend if if ==4
	   }      

request.send(null); 
}

function getColumn2Data()
{
	var params2='listingGetData.php?state=MD';
	request.open("GET", params2, true); 
	request.onreadystatechange = function() {
      if (request.readyState == 4) { 
	      		  document.getElementById('column2').innerHTML = request.responseText;
				  getColumn3Data();
		                           }//nend if if ==4
	   }      

request.send(null); 
}

function getColumn3Data()
{
	var params2='listingGetData.php?state=DC';
	request.open("GET", params2, true); 
	request.onreadystatechange = function() {
      if (request.readyState == 4) { 
	      		  document.getElementById('column3').innerHTML = request.responseText;
		                           }//nend if if ==4
	   }      

request.send(null); 
}