var xmlHttp
function _doCheckUser(strUser) {
	var url="ajax.user.php?user=" + strUser;
	xmlHttp = GetXmlHttpObject(UserChange)
	xmlHttp.open("GET", url , true)
	xmlHttp.send(null)
}

function _doAdvCost(date,addType,picture) {
	var url="ajax.cost.php?date=" + date + "&type=" + addType + "&picture=" + picture;
	xmlHttp = GetXmlHttpObject(ReturnCost)
	xmlHttp.open("GET", url , true)
	xmlHttp.send(null)
}

function _doUserAdvCost(date,addType,picture,points_type,user_id) {
	var url="ajax.user.cost.php?date=" + date + "&type=" + addType + "&picture=" + picture + "&points_type=" + points_type + "&user_id=" + user_id;
	xmlHttp = GetXmlHttpObject(ReturnUserCost)
	xmlHttp.open("GET", url , true)
	xmlHttp.send(null)
}

function ReturnCost() {
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {
		document.getElementById("idCost").innerHTML = "Rs. " + xmlHttp.responseText;
	}	
}

function ReturnUserCost() {
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {
		document.getElementById("idCost").innerHTML = xmlHttp.responseText + " Points";
	}	
}

function UserChange() { 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {
		document.getElementById("idUser").innerHTML = xmlHttp.responseText;
		//alert(xmlHttp.responseText);
	} 
}

function GetXmlHttpObject(handler) { 
	var objXmlHttp=null

	if (navigator.userAgent.indexOf("Opera")>=0) {
		alert("This example doesn't work in Opera") 
		return; 
	}
	if (navigator.userAgent.indexOf("MSIE")>=0)	{ 
		var strName="Msxml2.XMLHTTP"
		if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
		{
			strName="Microsoft.XMLHTTP"
		} 
		try	{ 
			objXmlHttp=new ActiveXObject(strName)
			objXmlHttp.onreadystatechange=handler 
			return objXmlHttp
		} catch(e) { 
			alert("Error. Scripting for ActiveX might be disabled") 
			return 
		} 
	} 
	if (navigator.userAgent.indexOf("Mozilla")>=0) {
		objXmlHttp=new XMLHttpRequest()
		objXmlHttp.onload=handler
		objXmlHttp.onerror=handler 
		return objXmlHttp
	}
}