function showUser(str)
 {
 if (str=="")
   {
   document.getElementById("txtHint").innerHTML="";
   return;
   } 
if (window.XMLHttpRequest)
   {// code for IE7+, Firefox, Chrome, Opera, Safari
   xmlhttp=new XMLHttpRequest();
   }
 else
   {// code for IE6, IE5
   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
 xmlhttp.onreadystatechange=function()
   {
   if (xmlhttp.readyState==4 && xmlhttp.status==200)
     {
     document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
     }
   }
 xmlhttp.open("GET","gestione/get_categoria.php?q="+str,true);
 xmlhttp.send();
 }

 

 function showUser2(str)
 {
 if (str=="")
   {
   document.getElementById("txtHint2").innerHTML="";
   return;
   } 
if (window.XMLHttpRequest)
   {// code for IE7+, Firefox, Chrome, Opera, Safari
   xmlhttp=new XMLHttpRequest();
   }
 else
   {// code for IE6, IE5
   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
 xmlhttp.onreadystatechange=function()
   {
   if (xmlhttp.readyState==4 && xmlhttp.status==200)
     {
     document.getElementById("txtHint2").innerHTML=xmlhttp.responseText;
     }
   }
 xmlhttp.open("GET","gestione/get_sotto_categoria.php?q="+str,true);
 xmlhttp.send();
 }