Пример реализации простой проверки формы на JavaScript без использования jQuery. Пример формы:

<form name="form_name" method="POST" action="/">
    <input type="text" name="fio" />
    <input type="text" name="email" />
    <input type="text" name="message" />
    <input type="button" value="send" onClick="check_form()" />
</form>

Реализация простой валидации формы на JavaScript:

function IsText(obj,msg) {
    if( obj.value.length == 0 ) {
        alert(msg);
        obj.focus();
    }
}

function check_form() {
   var ob = document.forms['form_name'];
   if( IsText(ob.fio, "Укажите ФИО, пожалуйста") != 1 ) return;
   if( IsText(ob.email, "Укажите ваш e-mail, пожалуйста") != 1 ) return;
   if( IsText(ob.message, "Введите сообщение, пожалуйста") != 1 ) return;
   ob.submit();
}

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