String.prototype.trimString = function(){
	return this.replace(/^\s+|\s+$/g,"");
}

function chkEmail(indirizzo){
	if (window.RegExp){
		var nonvalido = "(@.*@)|(\\.\\.)|(@\\.)|(\\.@)|(^\\.)";
		var valido = "^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$";
		var regnv = new RegExp(nonvalido);
		var regv = new RegExp(valido);
		if (!regnv.test(indirizzo) && regv.test(indirizzo)){
			return true;
		} else {
			return false;
		}
	} else {
		if(indirizzo.indexOf("@") >= 0) {
			return true;
		} else {
			return false;
		}
	}
}