function addListener(element, baseName, handler){//oggetto, evento, funzione
	if(element.addEventListener){
		element.addEventListener(baseName, handler, false);
	}else if(element.attachEvent){
		element.attachEvent('on' + baseName, handler);
	}
}//addListener

var _POPUP_COST_FEATURES = ', left=20, top=20, resizable=no, scrollbars=no, menubar=no, toolbar=no, directories=no, location=no, status=no';
var _POPUP_FEATURES = 'width=400, height=300';

function link_popup(url, target, features) {
   features = features || _POPUP_FEATURES;
   features = features + _POPUP_COST_FEATURES;
   target = target || '_blank';
  var theWindow = window.open(url, target, features);
  theWindow.focus();
  return theWindow;
}

function event_popup_features(features) {//questa funzione mi serve per passare i parametri senza attivare la funzione
	return function(e) { 
		e= e || event;
		var obj= e.target || e.srcElement;
		link_popup(obj.getAttribute('href'), obj.getAttribute('target') || '_blank', features);
		if(e.preventDefault){
			e.preventDefault();
		}else{
			e.returnValue=false;
		} 
	}
}

function init(){
	addListener(document.getElementById("contacts"), 'click', event_popup_features('width=280, height=400'));
}//init

addListener(window, 'load', init);