var xmlHttp;

function GetCityList()
{ 

	var s_state = document.getElementById("yel_state").value;
	var url = "../ajax_database_health.asp?state="+ s_state +"";
	xmlHttp = GetXmlHttpObject(stateChanged);
	xmlHttp.open("GET", url , true)
	xmlHttp.send(null)
} 

function stateChanged()
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		document.getElementById("city_combo").innerHTML = xmlHttp.responseText;
	} 
	else
	{
		document.getElementById("city_combo").innerHTML = "<b>Please Wait....</b>"
	}
} 

function GetXmlHttpObject(handler)
{ 
	var objXmlHttp=null

	if (navigator.userAgent.indexOf("Opera")>=0)
	{
		alert("This example doesn't work in Opera");
		return;
	}

	if (navigator.userAgent.indexOf("MSIE")>=0)
	{ 
		var strName = "Msxml2.XMLHTTP";
		if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
		{
			strName="Microsoft.XMLHTTP";
		} 
		try
		{ 
			objXmlHttp = new ActiveXObject(strName)
			objXmlHttp.onreadystatechange = handler;
			return objXmlHttp;
		} 
		catch(e)
		{ 
			alert("Error. Scripting for ActiveX might be disabled");
			return;
		} 
	}
	
	if (navigator.userAgent.indexOf("Mozilla")>=0)
	{
		objXmlHttp = new XMLHttpRequest()
		objXmlHttp.onload  = handler;
		objXmlHttp.onerror = handler;
		return objXmlHttp;
	}
}