/**
 * @filename		ajax_simple.js
 * @description		一个简化的ajax库
 * @copyright		Copyright 2008, xunlei.com.
 * @version		
 * @modifiedby		蔡英耀 (cyy0523xc@gmail.com) 
 * @lastmodified	2008/08/04
 */


function $obj(oid){
	return document.getElementById(oid);
}

function xlAjax(url, pars, successFun)
{
var aj = new Object();
aj.url=url;
aj.pars=pars;
aj.resultHandle=successFun;
aj.createXMLHttpRequest = function() {
  var request = false;
  if(window.XMLHttpRequest) {
   request = new XMLHttpRequest();
   if(request.overrideMimeType) {
    request.overrideMimeType('text/xml');
   }
  } else if(window.ActiveXObject) {
   var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
   for(var i=0; i<versions.length; i++) {
    try {
     request = new ActiveXObject(versions[i]);
     if(request) {
      return request;
     }
    } catch(e) {}
   }
  }
  return request;
}

aj.XMLHttpRequest=aj.createXMLHttpRequest();

aj.processHandle = function() {
	if(aj.XMLHttpRequest.readyState==4 && aj.XMLHttpRequest.status == 200) {
		aj.resultHandle(aj.XMLHttpRequest);
	}
}

aj.get = function() {
	try{
		aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
		aj.XMLHttpRequest.open("GET",aj.url+"?"+aj.pars);
		aj.XMLHttpRequest.send(null);
	}catch(e){
		
	}
}

aj.post = function() {
	try{
	  aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
	  aj.XMLHttpRequest.open('POST',aj.url,true);
	  aj.XMLHttpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
	  aj.XMLHttpRequest.send(aj.pars);
	}catch(e){
		alert(e);
	}
}

  return aj;
}


function getQueryString( frm_id ){
	var queryString="";
	var frm = document.getElementById(frm_id);
	var numberElements =  frm.elements.length;
	var q = '';
	var name = '';
	for(var i = 0; i < numberElements; i++) {
		name = frm.elements[i].name;
		if(name!='submit' && name!='') {
			queryString += q + name+"="+encodeURIComponent(frm.elements[i].value);
			q = '&';
		}
	}

	return queryString;
}