function jointour(eventid,action,tours)
{
document.getElementById('jointourblock').innerHTML='';
document.getElementById('coverblock').style.display='block';
document.getElementById('jointourblock').style.visibility='visible';
var xmlhttp;
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else if (window.ActiveXObject)
  {
  // code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
else
  {
  alert("Your browser does not support XMLHTTP!");
  }

xmlhttp.onreadystatechange=function()
{
if(xmlhttp.readyState==3)
  {
  document.getElementById("jointourblock").innerHTML="<center><br><br><br><br><br><br><br><img src=\"ajax/ajax-loader.gif\"></center>";
  }
if(xmlhttp.readyState==4)
  {
  document.getElementById("jointourblock").innerHTML=xmlhttp.responseText;
  }
}
xmlhttp.open("GET","ajax/first/jointours.php?event=" + eventid + "&action="+ action+"&tours=" + tours,true);
xmlhttp.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
xmlhttp.send(null);
}