function checkForm(myForm) {
	var invalid = "";
	var emailVal = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
	var messageVal = /[a-zA-Z0-9]/;
	
	if (!messageVal.test(myForm.name.value)){
		invalid += "\n -  Invalid name field";
	}
	if (!emailVal.test(myForm.email.value)){
		invalid += "\n -  Invalid email  field";
	}
	if (!messageVal.test(myForm.subject.value)){
		invalid += "\n -  Empty subject field";
	}
	if (!messageVal.test(myForm.message.value)){
		invalid += "\n -  Empty message field";
	}
	if (invalid != "") {
		alert(invalid);
		return false;
	}
	else return (true);
}