var AjaxCounter = 0;
var GlobalExecFunction = [];
var xmlHttp = [];
var isFinish = [];
var toUpdatePanel = [];

function StopAjax()
{   
    GlobalExecFunction.length = 0;
    xmlHttp.length = 0;
    isFinish.length = 0;
    toUpdatePanel.length = 0;
    AjaxCounter = 0;
    
    return true;
}

function GetXmlHttpObject()
{ 
	var objXMLHttp=null
	if (window.XMLHttpRequest)
	{
		objXMLHttp=new XMLHttpRequest()
	}
	else if (window.ActiveXObject)
	{
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
	}
	
	return objXMLHttp
}


function ajaxGet(httpString, ExecFunction)
{
    var localCounter = AjaxCounter;
    AjaxCounter = AjaxCounter + 1;
    
    toUpdatePanel[localCounter] = "";
    GlobalExecFunction[localCounter] = ExecFunction;
    xmlHttp[localCounter] = GetXmlHttpObject();
    isFinish[localCounter] = false;
    
	if (xmlHttp[localCounter]==null)
	{
		alert ("Browser does not support HTTP Request");
		return false;
	}
	
	if (httpString.indexOf('?')==-1)
	{
		var delChar = '?';
	}
	else
	{
		var delChar = '&';
	}

    
	var callid = delChar + "callid="+Math.random()
    
	xmlHttp[localCounter].onreadystatechange=ChangeStatus;
	xmlHttp[localCounter].open("GET",httpString + callid,true);
	xmlHttp[localCounter].send(null);
    
    return true;
}
function ChangeStatus()
{
    for (var i=0; i<isFinish.length; i++)
    {
        if(isFinish[i] == false)
        {
            if (xmlHttp[i].readyState == 4 || xmlHttp[i].readyState == "complete") 
            {
                isFinish[i] = true;
                
                if(toUpdatePanel[i] == "")
                {
                    GlobalExecFunction[i](xmlHttp[i].responseText);
                }
                else
                {
                    document.getElementById(toUpdatePanel[i]).innerHTML=xmlHttp[i].responseText;
                }
                xmlHttp[i] = null;
            }
        }
    }
}

var Url = {

    // public method for url encoding
    encode : function (string) {
        return escape(this._utf8_encode(string));
    },
    
    // public method for url decoding
    decode : function (string) {
        return this._utf8_decode(unescape(string));
    },

    // private method for UTF-8 encoding
    _utf8_encode : function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";

        for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        }

        return utftext;
    },

    // private method for UTF-8 decoding
    _utf8_decode : function (utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;

        while ( i < utftext.length ) {

            c = utftext.charCodeAt(i);

            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            }
            else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            }
            else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }

        }

        return string;
    }

}