var http = createRequestObject();
function createRequestObject() {
   var objAjax;
   var browser = navigator.appName;
   if(browser == "Microsoft Internet Explorer"){
      objAjax = new ActiveXObject("Microsoft.XMLHTTP");
   }else{
      objAjax = new XMLHttpRequest();
   }
   return objAjax;
}

function getCommercial(){
 document.getElementById('statusIcon').style.visibility = 'visible';
   http.open('get','e_commercial.html');
   http.onreadystatechange = updateNewContent;
   http.send(null);
   return false;
}

function getCorporate(){
 document.getElementById('statusIcon').style.visibility = 'visible';
   http.open('get','e_corporate.html');
   http.onreadystatechange = updateNewContent;
   http.send(null);
   return false;
}

function getMarine(){
 document.getElementById('statusIcon').style.visibility = 'visible';
   http.open('get','e_marine.html');
   http.onreadystatechange = updateNewContent;
   http.send(null);
   return false;
}

function getMilitary(){
 document.getElementById('statusIcon').style.visibility = 'visible';
   http.open('get','e_military.html');
   http.onreadystatechange = updateNewContent;
   http.send(null);
   return false;
}


function updateNewContent(){
   if(http.readyState == 4){
   	document.getElementById('statusIcon').style.visibility = 'hidden';
      document.getElementById('enginedisplay').innerHTML = http.responseText;
   }
}