window.onload = function () {

    $("#email-val").focusin(function() {
        if($("#email-val").val() == 'váš e-mail')
            $("#email-val").val('');
    });

    $("#email-val").focusout(function() {
        if($("#email-val").val() == '')
            $("#email-val").val('váš e-mail');
    });
    
};