function getRadioValue(oRadio, trg){
	val = '';
	if(oRadio.length > 0){
		for(i=0;i<oRadio.length;i++){
			if( oRadio[i].checked == true )
			(trg == 'value')? val = oRadio[i].value: val = oRadio[i].id;
		}
	}else{
		(trg == 'value')? val = oRadio[i].value: val = oRadio[i].id;
	}
	return val; 
}

function sendAjaxRequest(url, postdata, eventhandler) {
  if (window.ActiveXObject) {
	var xhr = new ActiveXObject("Microsoft.XMLHTTP");
  } else if (window.XMLHttpRequest) {
	var xhr = new XMLHttpRequest();
  }
  xhr.onreadystatechange = function() {
	 if(xhr.readyState == 4)
		if(xhr.status == 200)
		   eventhandler(xhr)
		else {
		   alert('mislukt: ' + xhr.status + ' ' + xhr.statusText )
		   document.body.innerHTML = xhr.responseText
		}
  }
  xhr.open("POST", url, true )
  xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded')
  xhr.send(postdata)
}