function changesubcol(idhs,mhs,ppa,vcat,idvt)
  {
  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)
        {
        document.getElementById("subcol").innerHTML=xmlHttp.responseText;
        }
      }
	url="propertyvtajax.php?idhs="+idhs+"&mhs="+mhs+"&ppa="+ppa+"&vcat="+vcat+"&idv="+idvt;
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
  }