var xmlHttp;

function showData(str) { 
    xmlHttp = GetXmlHttpObject();
    if (xmlHttp == null) {
        alert ("Your browser does not support XMLHTTP");
        return;
    } 
    setCookie('provid', str);
    
    var url = "get_cities.asp";
    url = url + "?q=" + str;
    url = url + "&sid=" + Math.random();
    xmlHttp.onreadystatechange = stateChanged;
    xmlHttp.open("GET", url, true);
    xmlHttp.send(null);    
}
function stateChanged() { 
    if (xmlHttp.readyState == 4) { 
        document.getElementById("city_content").innerHTML = xmlHttp.responseText;
    }
}
function GetXmlHttpObject() {
    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;
}