var AjaxLib = new function() {
   
    return {

        sendRequest: function(ajaxObj, data, serverPage) {
    	    ajaxObj.open('post',serverPage);
    	    ajaxObj.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
            ajaxObj.send(data);        
            },

    	//crea oggetto XMLRequest in base al browser
    	createRequestObject: function() {
    	    var ro;
    	    var browser = navigator.appName;
    		if(browser == "Microsoft Internet Explorer") {
    	        ro = new ActiveXObject("Microsoft.XMLHTTP");
    	        }
            else {
    	        ro = new XMLHttpRequest();
    	        }
    	    return ro;
            }
        }
    }