var xmlHttp;

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;
}


function stateChanged() 
{ 
	if (xmlHttp.readyState==4)
	{ 
		var myObj = eval('('+xmlHttp.responseText+')');	
		if (myObj)
		{
			implementCallbackSuccess(myObj);
		}
		else
		{
			implementCallbackFailed();
		}
	}
}

//HTTP_SERVER
function processAjaxCall(host, str, holder)
{
    // string of data to send
	if (str.length==0)
	{ 
		document.getElementById(holder).innerHTML="";
		return;
	}
	
	var waitText = 'Processing...';
	document.getElementById(holder).innerHTML = waitText;
	
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
		alert ("Your browser does not support AJAX!");
		return;
	} 
	
	var url = host+str;

	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url);
	xmlHttp.send(null);
	
	return false;

}