function getXMLHTTP() { //fuction to return the xml http object
		var xmlhttp=false;	
		try{
			xmlhttp=new XMLHttpRequest();
		}
		catch(e)	{		
			try{			
				xmlhttp= new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e){
				try{
				xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
				}
				catch(e1){
					xmlhttp=false;
				}
			}
		}
		 	
		return xmlhttp;
	}


function chk_user_avail(value,div_id,ext_file,type) {		
var req = getXMLHTTP();
var url=ext_file
url=url+"?val="+value
url=url+"&type="+type
//url=url+"&field="+fieldname
url=url+"&sid="+Math.random()
if (req) {		
		req.onreadystatechange = function() {
			if (req.readyState == 4) {
				// only if "OK"
				if (req.status == 200) {						
					document.getElementById(div_id).innerHTML=req.responseText;						
				} else {
					alert("There was a problem while using XMLHTTP:\n" + req.statusText);
				}
			}				
		}			
		req.open("GET", url, true);
		req.send(null);
	}
			
}


/*
var xmlHttp
var divid

function chk_user_avail(value,div_id,ext_file,type,fieldname)
{ 

divid=div_id
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
//alert(username);
var url=ext_file
url=url+"?val="+value
url=url+"&type="+type
url=url+"&field="+fieldname
url=url+"&sid="+Math.random()
alert('val= '+url)
xmlHttp.onreadystatechange=stateChanged
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}

///function needed for addUser
function stateChanged() 
{ 

if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 { 
  	var a = divid
 document.getElementById(a).innerHTML=xmlHttp.responseText
  
 } 
}

//////////////////////////////////////////////////////////////////////////////////////////////

function show_archive(month,year)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
// alert(document.showarch.year.value)
// alert(year);
var url="show_archived_trans.php"
url=url+"?month="+month
url=url+"&year="+year
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange=stateChanged_showarchived
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}

///function needed for addUser
function stateChanged_showarchived() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 { 
 	var a = "show_archive_container";
 document.getElementById(a).innerHTML=xmlHttp.responseText 
 } 
}

/////////
//mendatory for all functions
function GetXmlHttpObject()
{
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;
}*/