function forum(valor){

 function createRequestObject() 
	{ //funcao que permite criar um objecto do tipo XMLREQUEST
           var ro;
           var browser = navigator.appName;
           if(browser == "Microsoft Internet Explorer")
		   {
               ro = new ActiveXObject("Microsoft.XMLHTTP"); // ie
           }else{
               ro = new XMLHttpRequest(); // firefox/safari
           }
               return ro;
     }
	 
   var http = createRequestObject(); //inicia o objecto do tipo XMLRequest
   
     
   

   http.open('post', 'modules/changeForum.php', 'true' ); // constroi o pedido ajax
   http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=ISO-8859-1');
   http.onreadystatechange = handleResponse; // fica a espera do pedido
   http.send("id="+valor); 

   function handleResponse() 
	  {
                        
          if(http.readyState == 4)
          {
              var response = http.responseText;
              var update = new Array();
    
			  if(response.lenght!=0 )
			  {
                
                     
					  document.getElementById( "forumDiv").innerHTML =response;
       
                    
              }
                     
          }
       }    
	
	
	
	
	return false;
	
}