function MetodoPost(url, parametri, callback){
	
	obj = zXmlHttp.createRequest();
	obj.onreadystatechange = function() {
    
    	if (obj.readyState == 4) {
			
			if (obj.status == 200) { callback(obj.responseText); }
    	
		}
   
   };
   
   obj.open('POST', url, true);
   obj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
   obj.setRequestHeader("Content-length", parametri.length);
   obj.setRequestHeader("Connection", "close");
   obj.send(parametri);

}

function MetodoGet(url, callback){
 
	obj = zXmlHttp.createRequest();
	obj.onreadystatechange = function() {
    
    	if (obj.readyState == 4) {
		
        	if (obj.status == 200) { callback(obj.status); }
	   
    	}
   
   
    };
   
    obj.open('GET', url, true);
    obj.setRequestHeader("Connection", "close");
    obj.send(null); 
}