$(function() {
    var email = $('#email-add');
    prepareInput(email, 'Váš email');
    var email = $('#email-del');
    prepareInput(email, 'Váš email');
    $('#mailer form').submit(searchSubmit);
});

function prepareInput(input, def) {
    input.data('showText', def);
    if(input.val() == '') {
        input.val(def);
        input.css('color', '#999');
    }
    input.focus(function() {
        if($(this).val() == def) {
            $(this).val('');
            $(this).css('color', '#000');
        }
    });
    input.blur(function() {
        if($(this).val() == '') {
            $(this).val(def);
            $(this).css('color', '#999');
        }
    });
}

function searchSubmit() {
    var email = $(this).find('input[type="text"]');
    if(email.val() == email.data('showText')) {
        alert('Vložte email');
        return false;
    } else {
        var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
        if(reg.test(email.val()) == false) {
            alert('Neplatný email - nesprávný formát');
            return false;
        }
    }
    return true;
}