function getXMLHttp()
{
  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;
      }
    }
  }
  return xmlHttp;
}


function upcomingShows()
{

  var params = "weekends=1";
  var xmlHttp = getXMLHttp();
  xmlHttp.open("POST", "upcoming_shows.php", true);
 
  xmlHttp.onreadystatechange = function()
  {
    if(xmlHttp.readyState == 4)
    {
      HandleResponse(xmlHttp.responseText);
    }
  }

  xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  xmlHttp.setRequestHeader("Content-length", params.length);
  xmlHttp.setRequestHeader("Connection", "close");

  xmlHttp.send(params);



} 


function HandleResponse(response)
{
  document.getElementById('upcoming_shows').innerHTML = response;
}



function showFoodMenu()
{

  var params = "";
  var xmlHttp = getXMLHttp();
  xmlHttp.open("POST", "food_menu.php", true);
 
  xmlHttp.onreadystatechange = function()
  {
    if(xmlHttp.readyState == 4)
    {
      HandleFoodMenuResponse(xmlHttp.responseText);
    }
  }

  xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  xmlHttp.setRequestHeader("Content-length", params.length);
  xmlHttp.setRequestHeader("Connection", "close");

  xmlHttp.send(params);



} 


function HandleFoodMenuResponse(response)
{
  document.getElementById('content').innerHTML = response;
  
  var directionHeight = document.getElementById('content').offsetHeight;       
  document.getElementById('main').style.height = 40 + directionHeight + "px";
}

function showHookahMenu()
{

  var params = "";
  var xmlHttp = getXMLHttp();
  xmlHttp.open("POST", "hookah_menu.php", true);
 
  xmlHttp.onreadystatechange = function()
  {
    if(xmlHttp.readyState == 4)
    {
      HandleFoodMenuResponse(xmlHttp.responseText);
    }
  }

  xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  xmlHttp.setRequestHeader("Content-length", params.length);
  xmlHttp.setRequestHeader("Connection", "close");

  xmlHttp.send(params);



} 


function HandleHookahMenuResponse(response)
{
  document.getElementById('content').innerHTML = response;
  
  var directionHeight = document.getElementById('content').offsetHeight;       
  var mainHeight = document.getElementById('main').offsetHeight;
  if(mainHeight < directionHeight)
  {
    document.getElementById('main').style.height = 40 + directionHeight + "px";
  }
}