var ajaxPath = location.href.substr(0, location.href.length - location.pathname.length ) + "/Ajax";
function preCustomerUpdate( obj ) {
    if ( obj.value != "" ) {
        url = ajaxPath;
        result = httpRequest( url, "POST", "action=setPreCustomerValue" );
    }
}
function httpRequest(url, requestType, requestParameters ) {
    
    // creates XMLHttpRequest object
    if (window.XMLHttpRequest) req = new XMLHttpRequest();
    else if (window.ActiveXObject) req = new ActiveXObject("Microsoft.XMLHTTP");    
    if ( requestType.toLowerCase() == "get" ) {        
        req.open("GET", url, false);
        req.send(null);
    }
    else {
        req.open("POST", url, false);
        req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        req.setRequestHeader("Content-length", requestParameters.length);
        req.setRequestHeader("Connection", "close");
        req.send(requestParameters);
    }
    return req.responseText;
}