control_form=function(form){
	this.fields={
		'nome'		:	/^[a-zA-Z ]+$/,
		'cognome'	:	/^[a-zA-Z ]+$/,
//		'email'		:	/^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9-]+)*$/
		'email'		:	 /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/
	};
	
	for(id in this.fields){
		if(!this.fields[id].test(form[id].value) ){
			alert('Compilare correttamente il campo '+form[id].name+'.');
			form[id].focus();
			return false;
		}
	}
	return true;
};