function km(qkm, tipologia, limit)
{
	var url = "script/ricerca.php?cerca=" + escape(qkm);
	
	if(tipologia){
		url += "&tipologia=" + tipologia;
	}
	
	if(limit){
		url += "&limit=" + limit;
	}
	
	new Ajax.Request(url,
 {
	 method:'get',
  onSuccess: function(transport){
	  var response = transport.responseText || "no response text";
	  document.getElementById("correlatikm").innerHTML = response;
  },
  onFailure: function(){
	  document.getElementById("correlatikm").innerHTML = "";
  }
 });
}