// ************************************
//
// Ajax connection methods
//
// *************************************
function openAjaxConnection (url, callBackFunc ) {
	var xmlHttp = GetAjaxObject();
	xmlHttp.onreadystatechange = function () {
		if ( xmlHttp.readyState == 4 ) {
			eval(callBackFunc + "()");
		}
	}
	
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
	return xmlHttp;
}


function GetAjaxObject() {
	var xmlHttp=null;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp = new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer
		try {
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}


function TD_AjaxFunction (url, callBack) {
	var xmlHttp = GetAjaxObject();
	xmlHttp.onreadystatechange = function () {
		if ( xmlHttp.readyState == 4 ) {
			eval (callBack + "(xmlHttp.responseText)");
		}
	}
	xmlHttp.open("GET", url, true);
	xmlHttp.send(null);
}

function TD_AjaxFunction_RespXML (url, callBack) {
	var xmlHttp = GetAjaxObject();
	xmlHttp.onreadystatechange = function () {
		if ( xmlHttp.readyState == 4 ) {
			eval (callBack + "(xmlHttp.responseXML)");
		}
	}
	xmlHttp.open("GET", url, true);
	xmlHttp.send(null);
}

function TD_AjaxPostFunction (url, callBack, bd) {
	var xmlHttp = GetAjaxObject();
	xmlHttp.onreadystatechange = function () {
		if ( xmlHttp.readyState == 4 ) {
			eval (callBack + "(xmlHttp.responseText)");
		}
	}
	xmlHttp.open("POST", url, true);
	xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	xmlHttp.setRequestHeader("Content-length", bd ? bd.length : 0 );
	xmlHttp.setRequestHeader("Connection", "close");
	xmlHttp.send(bd);
}