function CheckEmpty(field, name, fake) {
	if(field.value == '' || field.value == fake) {
		field.focus();
		alert('Please fill ' + name + '!');
		return false;
	} else {
		return true;
	}
}

function CheckEmail(field) {
	if(field.value.length > 7 && field.value.indexOf('@') > 0 && field.value.indexOf('.') > 0) {
		return true;
	} else {
		field.focus();
		alert('Please enter correct e-mail!');
		return false;
	}
}

function CheckIdentPass(field1, field2) {
	if(field1.value == field2.value) {
		return true;
	} else {
		field1.focus();
		alert('Password fields not identical!');
		return false;
	}
}

function CheckMaxLen(field, maxlen) {
	if(field.value.length > maxlen) 
		field.value = field.value.substring(0, maxlen);
}