var xmlHttp_zip_lookup;

function zip_lookup(){
	str = document.getElementById("zip_code_field").value;
	if(!str)return;

	
xmlHttp_zip_lookup=GetXmlHttpObject_zip_lookup();
if (xmlHttp_zip_lookup==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="http://www.oldstockcars.com/lincoln_illinois_62656/zip_lookup.php";
url=url+"?q="+str;
url=url+"&sid="+Math.random();
xmlHttp_zip_lookup.onreadystatechange=stateChanged_zip_lookup;
xmlHttp_zip_lookup.open("GET",url,true);
xmlHttp_zip_lookup.send(null);
} 

function stateChanged_zip_lookup() 
{ 
if (xmlHttp_zip_lookup.readyState==4)
{ 

		 var data = xmlHttp_zip_lookup.responseText.split(",");
		
			if(data[0] == "Could not find zip code."){
				alert("Could not find zip code! Please try again.");
				return;
			}	

		document.getElementById("city_field").value=data[0];	
		document.getElementById("state_field").value=data[1];
		document.getElementById("phone_field").value=data[2];


}
}


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