var bXmlHttpSupport = (typeof XMLHttpRequest != "undefined" || window.ActiveXObject);
var sgCookie = "";

function addPostParam(sParams, sParamName, sParamValue) {
    if (sParams.length > 0) {
        sParams += "&";
    }
    return sParams + encodeURIComponent(sParamName) + "=" 
                   + encodeURIComponent(sParamValue);
}

function addURLParam(sURL, sParamName, sParamValue) {
    sURL += (sURL.indexOf("?") == -1 ? "?" : "&");
    sURL += encodeURIComponent(sParamName) + "=" + encodeURIComponent(sParamValue);
    return sURL;   
}


if (typeof XMLHttpRequest == "undefined" && window.ActiveXObject) {

    function XMLHttpRequest() {

        var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",
                             "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",
                             "Microsoft.XMLHTTP"];
                         
        for (var i=0; i < arrSignatures.length; i++) {
            try {
        
                var oRequest = new ActiveXObject(arrSignatures[i]);
            
                return oRequest;
        
            } catch (oError) {
                //ignore
            }
        }          

        throw new Error("MSXML is not installed on your system.");               
    }
}


var Http = new Object;

Http.get = function (sURL, fnCallback, type, xml) {
 
    if (bXmlHttpSupport) {
   
        var oRequest = new XMLHttpRequest();
		if(type)
	        oRequest.open("get", sURL, true);
		else
			oRequest.open("get", sURL, false);
        oRequest.onreadystatechange = function () {
            if (oRequest.readyState == 4) {
                if(xml)
					fnCallback(oRequest.responseXML);
				else
	                fnCallback(oRequest.responseText);
            }
        }
        oRequest.send(null);    
    
    } else {
        alert("Your browser doesn't support HTTP requests.");
    }          

};

Http.post = function (sURL, sParams, fnCallback,type, xml) {
 
    if (bXmlHttpSupport) {
   
        var oRequest = new XMLHttpRequest();
		if(type)
	        oRequest.open("post", sURL, true);
		else
			oRequest.open("post", sURL, false);
        oRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		if(sgCookie != undefined && sgCookie!="")
			oRequest.setRequestHeader("cookie", sgCookie);
        oRequest.onreadystatechange = function () {
			if(oRequest.getResponseHeader("Set-Cookie"))
				sgCookie = oRequest.getResponseHeader("Set-Cookie");
            if (oRequest.readyState == 4) {
				if(xml)
					fnCallback(oRequest.responseXML);
				else
	                fnCallback(oRequest.responseText);
            }
        }
        oRequest.send(sParams);    
    
    } else {
        alert("Your browser doesn't support HTTP requests.");
    }          

};