var xmlhttp
var UnitID=0;

function loadApartments(PropertyID)
{
xmlhttp=null
if (window.XMLHttpRequest)
  {
  xmlhttp=new XMLHttpRequest()
  }
else if (window.ActiveXObject)
  {
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
  }
if (xmlhttp!=null)
  {
  xmlhttp.onreadystatechange=state_Change
  xmlhttp.open("GET","apartments.htm?ID="+PropertyID+"&sec="+UnitID,true)
  xmlhttp.send(null)
  }
}

function state_Change()
{
// if xmlhttp shows "loaded"
if (xmlhttp.readyState==4)
  {
  // if "OK"
  if (xmlhttp.status==200)
  {
  document.getElementById('Apartments').innerHTML=xmlhttp.responseText
  }
  }
}