function ajaxFunction()
{
  var xmlHttp;
  try
    {
    // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
    }
  catch (e)
    {
    // Internet Explorer
    try
      {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
    catch (e)
      {
      try
        {
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
      catch (e)
        {
        alert("Your browser does not support AJAX!");
        return false;
        }
      }
    }
    xmlHttp.onreadystatechange=function()
      {
      if(xmlHttp.readyState==4)
        {
			if(xmlHttp.responseText != "yes")
			{
				document.myForm.time.value=param;
			}
			else
			{
				document.myForm.time.value=xmlHttp.responseText;
			}
        }
      }
    xmlHttp.open("GET","time.php",true);
    xmlHttp.send('name=' + document.myForm.username.value + '&password=' + document.myForm.password.value);
}

    xmlHttp.send('name=' + document.myForm.username.value + '&password=' + document.myForm.password.value);