function checkEmail(email){

	if (email == '')

		return true;

	if (email.indexOf('@') == -1)

		return false;

	if (email.length < 4)

		return false;

	if (email.indexOf('@') != email.lastIndexOf('@'))

		return false;

	if (email.indexOf(' ') != -1)

		return false;

	return true;

}



function enableCheckbox() {

	form = document.formularz;

	if (form.email.value.length != 0) {

		form.send_copy.disabled = false;

	} else {

		form.send_copy.disabled = true;

	}

}



function validate(form) {

	var res = '';

	if (form.send_copy.checked && form.email.value=="") {
				res = "Prosimy o podanie adresu e-mail.\n";
			}
			if (checkEmail(form.email.value) == false) {

		res = "Niepoprawny adres email\n";

	}


	if (form.shopID.value == 'shopd000')

		res = res + "Nie wybrano sklepu\n";


	if (form.topic.value == '')

		res = res + "Nie podano tematu\n";



	if (form.opinion.value == '')

		res = res + "Nie podano treści."



	//if (form.name.value != '' && form.email.value == '' )

	 //       res = res + "Prosimy o podanie adresu e-mail."



	if (res != '') {

		alert(res);

		return false;

	}

			form.submit_button.disabled=true;

	return true;

}