function validateForm(form) {
	var proceed = true;
	
	for (var i=0;i<form.elements.length;i++) {
		if (form.elements[i].className == "required") {
			if (form.elements[i].value == "") {
				proceed = false;
				form.elements[i].focus();
				form.elements[i].style.backgroundColor = '#FF3333';
			}
		}
	}

	if (proceed == false) { alert('Please fill the fields marked with red.'); }

	return proceed;
}