// JavaScript Document
function ajaxLoad(method, URL, data, displayId) {
var ajax = null;
if(window.ActiveXObject) {
	ajax = new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest){
	ajax = new XMLHttpRequest();
}
else {
	alert("Your Browser doesn't support Ajax");
	return;
}

method = method.toLowerCase();

URL +="?dummy="+(new Date()).getTime();

if(method.toLowerCase()=="get"){
	URL +="&"+data;
	data=null;
}

ajax.open(method,URL);
	
if(method.toLowerCase()=="post") {
	ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
}
	
	ajax.onreadystatechange = function() {
		if(ajax.readyState==4 && ajax.status==200){
			var ctype = ajax.getResponseHeader("Content-Type");
			ctype = ctype.toLowerCase();
			
			ajaxCallback(ctype, displayId, ajax.responseText);
			delete ajax;
			ajax = null;
		}
	}
	ajax.send(data);
}


function ajaxCallback(contentType, displayId, responseText) { //แสดงผลลัพธ์จาก  Server 
if(contentType.match("text/javascript")){
	eval(responseText);
}
else{
	var el = document.getElementById(displayId);
	el.innerHTML= responseText;
}
}

function getFormData(form_name_or_id){
	var frm = document.forms[form_name_or_id];
	if(frm==null){
		alert("form not found!");
		return;
	}
	
	var data ="";
	var num_el = frm.elements.length;
	for(i=0; i<num_el; i++) {
		var el = frm.elements[i];
		if(el.name=="" && el.id=="") {
			continue;
		}
		var param_name = "";
		if(el.name!="") {
			param_name = el.name;
		}
		else if(el.id!="") {
			param_name = el.id;
		}
		
		var t = frm.elements[i].type;
		var value = "";
		if(t=="text"||t=="password"||t=="hidden"||t=="textarea") {
			value = encodeURI(el.value);
		}
		else if(t=="radio"||t=="checkbox") {
			if(el.checked){
				value = encodeURI(el.value);
			}
			else {
				continue;
			}
		}
		else if(t=="select-one") {
			value = encodeURI(el.options[el.selectedIndex].value);
		}
		else if(t=="select-multiple"){
			for(j=0;j<el.length;j++){
				if(el.options[j].selected){
					if(data!="") {
						data += "&";
					}
					data += param_name + "=";
					data += encodeURI(el.option[j].value);
				}
			}
			
			continue;
		}
		if(data!=""){
			data += "&";
		}
		data += param_name + "=" + value;
	}
	return data;
}