function CheckStr(srcStr){
    var dstStr;
    dstStr = srcStr;
    dstStr = dstStr.replace(/</g, "<");
    dstStr = dstStr.replace(/>/g, ">");
    dstStr = dstStr.replace(/&/g, "&");
    return dstStr;
}

function TryThese(){
    for (i = 0; i < arguments.length; i++){
        try{
            return arguments[i]();
        }catch(e){}
    }
    return false;
}

function CreateXMLHTTP(){
    return TryThese(
        function() {return new ActiveXObject("Msxml2.XMLHTTP");},
        function() {return new ActiveXObject("Microsoft.XMLHTTP");},
        function() {return new XMLHttpRequest();}
    ) || false;
}

function SendRequest(url, param, method, echofun) {
    var xmlHTTP = CreateXMLHTTP();
    if (xmlHTTP){
        xmlHTTP.onreadystatechange = function()
        {
            if (xmlHTTP.readyState == 4 && xmlHTTP.status == 200){
                if (echofun!= null){
                    echofun(xmlHTTP.responseText);
                }
            }
        }
        xmlHTTP.open(method, url, true);
        xmlHTTP.setRequestHeader("Content-Length",param.length); 
        xmlHTTP.setRequestHeader("CONTENT-TYPE","application/x-www-form-urlencoded");
        xmlHTTP.send(encodeURI(param));    
    }else{
        NoXMLHTTP();
    }
}

function NoXMLHTTP(){
    alert("Sorry, your browser doesn't support XMLHTTP");
}