function zkontroluj(formular)
{
        if (formular.jmeno.value=="")
    {
        alert("Fill in your name...");
        formular.jmeno.focus();
        return false;
    }
	    else if (formular.prijmeni.value=="")
    {
        alert("Fill in your Surname...");
		        formular.prijmeni.focus();
        return false;
    }
		 else if (formular.rc.value=="")
    {
        alert("Fill in your Birth Number (or date of birth)...");
		        formular.rc.focus();
        return false;
    }
		 else if (formular.mobil.value=="")
    {
        alert("Fill in your mobile phone number...");
		        formular.mobil.focus();
        return false;
    }
    else if (formular.email.value=="")
    {
        alert("Fill in your e-mail...");
		        formular.email.focus();
        return false;
    }
	else if (window.RegExp)
    {
        re = new RegExp("^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$");
        if (!re.test(formular.email.value))
        {
            alert("Your e-mail address is not correct...");
            formular.email.focus();
            return false;
        }
    }
    else
        return true;
}