function TestEmail(email)
{
	var ret = true;
	try {
		var zavinac = email.indexOf("@");
		var tecka = email.lastIndexOf(".");
		if (email != "") {
			if (zavinac < 1 || tecka > (email.length - 3) || tecka < 0 || ((zavinac + 2) > tecka)) ret = false;
		} else {
			ret = false;
		}
	} catch(e) {
		ret = false;
	}
	return ret;
}

function OnSubmit(AForm) {
	if (AForm.email.value != "" && !TestEmail(AForm.email.value)) {
		alert("Zadejte platný formát e-mailové adresy.");
		return false;
	} else if (AForm.email.value != "" && AForm.problem.value == "") {
		alert("Zadejte popis problému.");
		return false;
	} else if (AForm.email.value == "" && AForm.problem.value != "") {
		alert("Zadejte e-mailovou adresu.");
		return false;
	}
	return true;
}