Help please, loading javascript into a div with ajax

Help please, is that I want to load several different sliders within a div with ajax but the sliders need javascript code and does not run the show. Here you have an example of what happens to me and ajax code. I’m desperate to see if anyone helps me out, thanks. Sorry for my english, I’m from Spain.

Example:

https://dl.dropboxusercontent.com/u/27792874/ejemplo.rar

Code ajax:

<script>

function nuevoAjax(){

    var xmlhttp=false;
    try {
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
    try {
    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (E) {
    xmlhttp = false;
    }
    }

    if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
    xmlhttp = new XMLHttpRequest();
    }
    return xmlhttp;

}



function Cargar(url){


var centro_galeria = document.getElementById('centro_galeria');


ajax=nuevoAjax();
ajax.open("GET", url,true);

ajax.onreadystatechange=function(){

if(ajax.readyState==4){
	

centro_galeria.innerHTML=ajax.responseText;

}

}

ajax.send(null);




}


</script>