var http = false;

if(navigator.appName == "Microsoft Internet Explorer") {
  http = new ActiveXObject("Microsoft.XMLHTTP");
} else {
  http = new XMLHttpRequest();
} 

/* load research page */
function research() {
  http.open("GET", "/research.html", true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      document.getElementById('page').innerHTML = http.responseText;
    }
  }
  http.send(null);
}

/* load practice page */
function practice() {
  http.open("GET", "/practice.html", true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      document.getElementById('page').innerHTML = http.responseText;
    }
  }
  http.send(null);
}

/* load exhibition page */
function exhibition() {
  http.open("GET", "/exhibition.html", true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      document.getElementById('page').innerHTML = http.responseText;
    }
  }
  http.send(null);
}

/* load workshops page */
function workshops() {
  http.open("GET", "/workshops.html", true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      document.getElementById('page').innerHTML = http.responseText;
    }
  }
  http.send(null);
}

/* load residency page */
function residency() {
  http.open("GET", "/residency.html", true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      document.getElementById('page').innerHTML = http.responseText;
    }
  }
  http.send(null);
}

/* load studio page */
function studio() {
  http.open("GET", "/studio.html", true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      document.getElementById('page').innerHTML = http.responseText;
    }
  }
  http.send(null);
}

/* load biography page */
function biography() {
  http.open("GET", "/biography.html", true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      document.getElementById('page').innerHTML = http.responseText;
    }
  }
  http.send(null);
}

/* return to current page */
function current() {
  http.open("GET", "/current.html", true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      document.getElementById('page').innerHTML = http.responseText;
    }
  }
  http.send(null);
}