Ajax, post и амперсанд

function XmlHttp() 
{ 
var xmlhttp; 
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 ajax(param) 
{ 
                if (window.XMLHttpRequest) req = new XmlHttp(); 
                method=(!param.method ? "POST" : param.method.toUpperCase()); 
  
                if(method=="GET") 
                { 
                               send=null; 
                               param.url=param.url+"&ajax=true"; 
                } 
                else 
                { 
                               send=""; 
                               for (var i in param.data) send+= i+"="+param.data[i]+"&"; 
                               send=send+"ajax=true"; 
                } 
  
                req.open(method, param.url, true); 
                if(param.statbox)document.getElementById(param.statbox).innerHTML = '<img src="/images/wait.gif" width="100">'; 
                req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
                req.send(send); 
                req.onreadystatechange = function() 
                { 
                               if (req.readyState == 4 && req.status == 200) //если ответ положительный 
                               { 
                                               if(param.success)param.success(req.responseText); 
                                                
 
                                                
                               } 
                } 
}

<input type="text" maxlength="100" id="url" name="url" /> <a href="javascript:return false;" onclick="off(); ajax({url:'/serv.php',statbox:'status2',method:'POST',data:{container:document.getElementById('url').value,},success:function(data){document.getElementById('status2').innerHTML=data;}}); return false;"><span>Отправить</span></a>