//ajax

function getXmlHttpRequestObject() 
{
	if (window.XMLHttpRequest) 
	{
		return new XMLHttpRequest(); //Not IE
	} 
	else if(window.ActiveXObject) 
	{
		return new ActiveXObject("Microsoft.XMLHTTP"); //IE
	} 
	else 
	{
		alert("Your browser doesn't support the XmlHttpRequest object.  Better upgrade to Firefox.");
	}
}			

var http = getXmlHttpRequestObject();

function vf_field(id,val) 
{
  if(id=="repassword") {
		val+="&val2="+document.getElementById('password').value;  
  }
  http.open('get', 'ajax/vf_field.php?tip='+id+'&val='+val, true);
  document.getElementById('span-'+id).innerHTML='';
  http.onreadystatechange = handleResponse_vf_field;
  http.send(null);
  curr_id=id;
}

function handleResponse_vf_field() 
{
  if(http.readyState == 4)
  {
	  var response = http.responseText;
	  document.getElementById('span-'+curr_id).innerHTML = response;
  }
}