var JSON = function () {
    var m = {
            '\b': '\\b',
            '\t': '\\t',
            '\n': '\\n',
            '\f': '\\f',
            '\r': '\\r',
            '"' : '\\"',
            '\\': '\\\\'
        },
        s = {
            array: function (x) {
                var a = ['['], b, f, i, l = x.length, v;
                for (i = 0; i < l; i += 1) {
                    v = x[i];
                    f = s[typeof v];
                    if (f) {
                        v = f(v);
                        if (typeof v == 'string') {
                            if (b) {
                                a[a.length] = ',';
                            }
                            a[a.length] = v;
                            b = true;
                        }
                    }
                }
                a[a.length] = ']';
                return a.join('');
            },
            'boolean': function (x) {
                return String(x);
            },
            'null': function (x) {
                return "null";
            },
            number: function (x) {
                return isFinite(x) ? String(x) : 'null';
            },
            object: function (x) {
                if (x) {
                    if (x instanceof Array) {
                        return s.array(x);
                    }
                    var a = ['{'], b, f, i, v;
                    for (i in x) {
                        if (!x.hasOwnProperty || x.hasOwnProperty(i)) {
                            v = x[i];
                            f = s[typeof v];
                            if (f) {
                                v = f(v);
                                if (typeof v == 'string') {
                                    if (b) {
                                        a[a.length] = ',';
                                    }
                                    a.push(s.string(i), ':', v);
                                    b = true;
                                }
                            }
                        }
                    }
                    a[a.length] = '}';
                    return a.join('');
                }
                return 'null';
            },
            string: function (x) {
                if (/["\\\x00-\x1f]/.test(x)) {
                    x = x.replace(/([\x00-\x1f\\"])/g, function(a, b) {
                        var c = m[b];
                        if (c) {
                            return c;
                        }
                        c = b.charCodeAt();
                        return '\\u00' +
                            Math.floor(c / 16).toString(16) +
                            (c % 16).toString(16);
                    });
                }
                return '"' + x + '"';
            }
        };
    return {
        stringify: function (v) {
            var f = s[typeof v];
            if (f) {
                v = f(v);
                if (typeof v === 'string') {
                    return v;
                }
            }
            return;
        },
        parse: function (text) {
            try {
                return !(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(
                        text.replace(/"(\\.|[^"\\])*"/g, ''))) &&
                    eval('(' + text + ')');
            } catch (e) {
                return false;
            }
        }
    };
}();

var AJ = new Object();
AJ.READY_STATE_UNINITIALIZED = 0;
AJ.READY_STATE_LOADING = 1;
AJ.READY_STATE_LOADED = 2;
AJ.READY_STATE_INTERACTIVE = 3;
AJ.READY_STATE_COMPLETE = 4;
AJ.Request = function(url, data){
	this.unrequestBrowser = false;
	this.req = null;
	this.onOk =  (data.onOk) ? data.onOk : function (){};
	this.onError = (data.onError) ? data.onError : function (){};
	this.method = (!data.method || data.method != 'POST')? 'GET':'POST';
	this.contentType = (this.method != 'POST')?'':'application/x-www-form-urlencoded';
	this.headers = (!data.headers)? '':data.headers;
	this.loadData(this.method, url, data.params, this.contentType, this.headers);
}
AJ.Request.prototype = {
	urlEncodeData:function (data) {
		var query = [];
		if (data instanceof Object) {
			for (var k in data) {
				query.push(encodeURIComponent(k) + "=" + ((typeof data[k] == 'string')?encodeURIComponent(data[k]):JSON.stringify(data[k])));
			}
			return query.join('&');
		}else{
			return encodeURIComponent(data);
		}
	},
	loadData:function(method, url, params, contentType, headers) {
		
		if (window.XMLHttpRequest) {
			this.req=new XMLHttpRequest(); 
		} else if (window.ActiveXObject){
			this.req=new ActiveXObject("Microsoft.XMLHTTP");
		} else {
			this.unrequestBrowser = true;
			return;
		}
		if (this.req) {
			try {
				this.req.open(method,url,true);
				if (contentType){
					this.req.setRequestHeader('Content-Type', contentType);
				}
				if (headers) {
					for (var h in headers) {
						this.req.setRequestHeader(h,headers[h]);
					}
				}
				var loader=this;
				this.req.onreadystatechange=function() {
					req = loader.req;
					var ready=req.readyState;
					if (ready==AJ.READY_STATE_COMPLETE) {
						var httpStatus=req.status;
						if (httpStatus==200 || httpStatus==0) {
							loader.onOk(req);
						} else {
							loader.onError(req);
						}
					}
				}
				if(method=='POST'){
					this.req.send(this.urlEncodeData(params));
				}else{
					this.req.send(null);
				}
				
			} catch (err){
				alert(err);
				this.onError.call(this.req,err);
			}
		} 
	}
}

function doAction(url,params,onOk,onError,method){
	var ajr = new AJ.Request(url,{'method':(method && method.toUpperCase()=='POST')?'POST':'GET','params':params,'onOk':onOk,'onError':onError});
}