var xmlhttp;
function state_Change() {}

function send()
{
xmlhttp=null;
if (window.XMLHttpRequest)
  {// code for all new browsers
  xmlhttp=new XMLHttpRequest();
  }
else if (window.ActiveXObject)
  {// code for IE5 and IE6
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
if (xmlhttp!=null)
  xmlhttp.onreadystatechange=state_Change;
  var args = 'who='+document.getElementById('whogoing').value;
  xmlhttp.open('GET','/field_time.php?'+args,true); // set to true for asynch
  xmlhttp.send(null);
}