function elementFocus(inputID, valueID) {
	var obj = document.getElementById(inputID);
	if (obj.value == valueID) {
		obj.value = "";
	} else if (obj.value == "") {
		obj.value = valueID;
	} else if (obj.value != valueID) {
	}
	if(obj.className != "focus") {
    	if (obj.className != "required") { 
    	obj.className = "focus";
    	}
    } else {
    	obj.className = "blur";
    }
}

function checkForm() {
	var validForm = true;
	var elEmail = document.getElementById('email');
	var elNome = document.getElementById('nome');
	
	if (elEmail.value == "" || elEmail.value == "* indirizzo e-mail...") {
		elEmail.className = "required";
		validForm = false;
	} else {
		elEmail.className = "blur";
	}
	
	if (elNome.value == "" || elNome.value == "* Nome...") {
		elNome.className = "required";
		validForm = false;
	} else {
		elNome.className = "blur";
	}
	
	var regExp = /^[a-zA-Z0-9]+(?:[a-zA-Z0-9_-]+.)+@(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]{2,4}$/;
	var re = new RegExp(regExp);
	
	var el = document.getElementById('email');
	if (!el.value.match(re)) {
		el.className = "required";
		validForm = false;
	} else {
		el.className = "blur";
	}
	return validForm;
}