var xmlHttp; 
    var proc; 
    function chkAccount(chkfield,p) { 
        //proc = document.getElementById("imgproc"); 
        //proc.style.visibility = 'visible';
        createXMLHttpRequest();
        var myId = document.getElementById("c_account").value;
        var url = "valid-account.php?" + chkfield + "=" + myId + "";
        //document.write(url);
        xmlHttp.onreadystatechange = callback; 
        xmlHttp.open("POST", url, true);
        //xmlHttp.setRequestHeader("Content-Type","text/html;charset=utf-8");
        xmlHttp.send(null); 
    } 
    
    function createXMLHttpRequest() { 
        if (window.ActiveXObject) {
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); 
        } 
        else if (window.XMLHttpRequest) {
            xmlHttp = new XMLHttpRequest();                
        } 
    } 
    function callback() { 
        if (xmlHttp.readyState == 4) { 
            if (xmlHttp.status == 200) { 
                //var xmldoc = xmlHttp.responseXML;
                var mes = xmlHttp.responseXML.getElementsByTagName("message")[0].firstChild.data;
                var val = xmlHttp.responseXML.getElementsByTagName("passed")[0].firstChild.data;
                setMessage(mes, val);
            } 
        } 
    } 
    
    function setMessage(message, isValid) {            
        var messageArea = document.getElementById("divAccount"); 
        var fontColor = "red";
        if (isValid == "true" || isValid == "True") { 
            fontColor = "green";                
        } 
        //proc.style.visibility = 'hidden';
        messageArea.innerHTML = "<font color=" + fontColor + ">" + message + " </font>";
    }