var xmlHttp10

function showairports(str)
{ 

xmlHttp10=GetXmlHttpObject()
if (xmlHttp10==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
var url="showairports.php"
url=url+"?destino="+str
url=url+"&sid="+Math.random()
xmlHttp10.onreadystatechange=stateChanged 
xmlHttp10.open("GET",url,true)
xmlHttp10.send(null)
}

function stateChanged() 
{ 
if (xmlHttp10.readyState==4 || xmlHttp10.readyState=="complete")
 { 
 document.getElementById("destinos").innerHTML=xmlHttp10.responseText 
 } 
}

function GetXmlHttpObject()
{
var xmlHttp10=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp10=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp10=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp10=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp10;
}