php - JS events. Only one of the event handler function is being called? -

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hi everybody!
have problem , have no idea how fix it!

i have simple html page button:

<input type = "submit" value = "ok" onclick="f1()"/>

i have script on page:

<script>     function f2()     {               var firstbtn = document.createelement("button");             firstbtn.appendchild(document.createtextnode("firstbtn"));    document.body.appendchild(firstbtn);    var xmlhttp = createrequest();    xmlhttp.onreadystatechange=function()    {        if (xmlhttp.readystate==4 && xmlhttp.status==200)        {          var response = xmlhttp.responsetext;                         document.body.innerhtml += response;        }    }    firstbtn.onclick = function()    {      alert("inside f2 onclick");      xmlhttp.open("get","test.php",true);      xmlhttp.send();    }  }     function f3()   {      var secondbtn = document.createelement("button");                secondbtn.appendchild(document.createtextnode("secondbtn"));           document.body.appendchild(secondbtn);    var xmlhttp = createrequest();    xmlhttp.onreadystatechange=function()    {        if (xmlhttp.readystate==4 && xmlhttp.status==200)        {          var response = xmlhttp.responsetext;                         document.body.innerhtml += response;        }    }    secondbtn.onclick = function()    {      alert("inside f3 onclick");      xmlhttp.open("get","test.php",true);      xmlhttp.send();    } }   function f1()     {     f2();     f3();   }   function createrequest() {     var xmlhttp;     if (window.xmlhttprequest)                       xmlhttp=new xmlhttprequest();// code ie7+, firefox, chrome, opera, safari            else                             xmlhttp=new activexobject("microsoft.xmlhttp");// code ie6, ie5       return xmlhttp; } </script>

so now, when click 1 of buttons (firstbtn or secondbtn), 1 not responding click event! know why?

as @vishwanath said (see comments question), when doing 

 document.body.innerhtml += response;

i'm destroying , recreating content of page therefore i'm losing events.


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