var contentElement;
var xmlHttp;
var post=false;
var strPost;
function getContent(containerID,reqParam)
{
	if (reqParam.length==0)
	{ 
		document.getElementById(containerID).innerHTML="";
		return;
	}

	xmlHttp= new GetXmlHttpObject();
	
	if (xmlHttp==null)
	{
		alert ("Browser does not support HTTP Request");
		return;
	} 

	var url="getcontent.php";
	url=url+"?pg="+reqParam;
//random string meesturen zodat gegevens niet uit cache worden gehaald.
	url=url+"&sid="+Math.random();
	contentElement=containerID;
	xmlHttp.onreadystatechange=stateChanged;
	if(post==false)
		{
		xmlHttp.open("GET",url,true);
		xmlHttp.send(null);
		}
	else
	{
		xmlHttp.open("POST",url,true);
		xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		xmlHttp.send(strPost);
		strPost="";
		post=false;
	}

}

function stateChanged() 
{ 

	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		document.getElementById(contentElement).innerHTML=xmlHttp.responseText;
	} 
} 

function GetXmlHttpObject(handler)
{ 
	var objXMLHttp=null;
	if (window.XMLHttpRequest)
	{
		objXMLHttp=new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	return objXMLHttp;
}

function GetFormData(elements)
{
	strPost = "";
	var fields = elements.split(",");
	for(var i=0;i<fields.length;i++)
	{
		strPost =  strPost + fields[i] + "=" + document.getElementById(fields[i]).value + "&";
	}
	return strPost;
}