JavaScript functions ...

I have this javascript code, the problem is that i can only call it once, after that it won't work again ...

If I copy and paste the function it will still not work , until i will change variable Ajax into something else like Ajax2...
but this involve some copy&paste work , and i want to have it for unlimited hits..


Declaring Ajax on the top won't work , doing Ajax an vector as Ajax[x] won't work

<script type="text/javascript">

  

function trimite(url, parametri, divname){


      if (window.XMLHttpRequest) { Ajax = new XMLHttpRequest();  }
else if (window.ActiveXObject) {  if(!Ajax){Ajax = new ActiveXObject("Msxml2.XMLHTTP");}
                                  if(!Ajax){Ajax = new ActiveXObject("Microsoft.XMLHTTP");}
                                               }

function schimbari(){
if(Ajax.readyState == 4){document.getElementById(divname).innerHTML=Ajax.responseText;}


}  


Ajax.overrideMimeType('text/html');
Ajax.open('POST',url,true);
Ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded')
Ajax.setRequestHeader("Content-length", parametri);
Ajax.setRequestHeader("Connection", "close");
Ajax.send(parametri);
Ajax.onreadystatechange = schimbari;







    

}  

        


</script>

HTML:

 

How do you use the function? do you call trimite once and schimbari more than once? That could be the problem.
Your Ajax may be used only once.