combine multiple similar AJAX codes

I have the below code that goes with my site navigation. Since most of the code is the same I was wondering if there was a way to condense this. I'm super new to AJAX. Thanks

function web()
{
if(XMLHttpRequestObject) {
    var obj = document.getElementById('content');
    XMLHttpRequestObject.open("GET", "./nav/web.html");


    XMLHttpRequestObject.onreadystatechange = function()
    {
        if (XMLHttpRequestObject.readyState == 4 &&
        XMLHttpRequestObject.status == 200) {

            obj.innerHTML = XMLHttpRequestObject.responseText;
            }
        }
    XMLHttpRequestObject.send(null);
    }
}

functi开发者_Go百科on prices()
{
if(XMLHttpRequestObject) {
    var obj = document.getElementById('content');
    XMLHttpRequestObject.open("GET", "./nav/prices.html");


    XMLHttpRequestObject.onreadystatechange = function()
    {
        if (XMLHttpRequestObject.readyState == 4 &&
        XMLHttpRequestObject.status == 200) {

            obj.innerHTML = XMLHttpRequestObject.responseText;
            }
        }
    XMLHttpRequestObject.send(null);
    }
}

function clientList()
{
if(XMLHttpRequestObject) {
    var obj = document.getElementById('content');
    XMLHttpRequestObject.open("GET", "./nav/clientlist.html");


    XMLHttpRequestObject.onreadystatechange = function()
    {
        if (XMLHttpRequestObject.readyState == 4 &&
        XMLHttpRequestObject.status == 200) {

            obj.innerHTML = XMLHttpRequestObject.responseText;
            }
        }
    XMLHttpRequestObject.send(null);
    }
}

Yes you can, instead of having a function to each process, have built in a "template" that will hold every request, and then pass a variable to use like

switch(b) { case "web" : XMLHttpRequestObject.open("GET", "./nav/web.html"); break; case "prices" : XMLHttpRequestObject.open("GET", "./nav/prices.html");

here is a sample

function dameloPapa(a,b,c) {
if (a=="")
  {
  document.getElementById(c).innerHTML="";
  return;
  }
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById(c).innerHTML=xmlhttp.responseText;
    }
  }
switch(b){
case "web" : XMLHttpRequestObject.open("GET", "./nav/web.html?id"+a); break;
//etc...
}
xmlhttp.send();

This way you only call in your code using JavaScript (onclick, onchange, etc) dameloPapa('variable','op','div_id'); and show results on

I optimized one like this to be call upon anytime that I want, I mix a lot this with PHP, MySQL and works like a charm, hope this helps!