function $(id){return document.getElementById(id);}
function GetXmlHttpObject(handler)
{var objXmlHttp=null
if(navigator.userAgent.indexOf("Opera")>=0)
{objXmlHttp=new XMLHttpRequest();objXmlHttp.onload=handler;objXmlHttp.onerror=handler;return objXmlHttp;}
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;}}
function makeRequest(url,parameters,callback,requesttype,async)
{if(requesttype=='POST')
{xmlHttp=GetXmlHttpObject(callback)
xmlHttp.open("POST",url,async);xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");xmlHttp.send(parameters);}else if(requesttype=="GET")
{url=url+'?'+parameters;xmlHttp=GetXmlHttpObject(callback)
xmlHttp.open("GET",url,async)
xmlHttp.send(null)}}