function checkEmail(email) {

	if (email.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1) {						
		return true;
	} else {
		return false;
	}

}

function validateContactForm() {

	var subject = document.getElementById('subject');
	var email = document.getElementById('email');
	var message = document.getElementById('message');	
	
	if (email.value != "") {

		if (!checkEmail(email.value)) {
			alert("Your e-mail seems to be invalid!");
			email.focus();
			return false;	

		}

	}


	if (subject.value.length < 3) {
		alert("Please fill the subject of message!");
		subject.focus();
		return false;			
	}

	

	if (message.value.length < 3) {
		alert("Please fill the subject of message!");
		message.focus();
		return false;			
	}

	return true;		

}