var petrkolar = {
    SEARCH_FORM_HINT: "hledat",

    clearSearchFormHint: function (aEvent) {
        if (this.value == petrkolar.SEARCH_FORM_HINT) {
            this.value = "";
        }
    },

    fillSearchFormHint: function (aEvent) {
        if (this.value == "") {
            this.value = petrkolar.SEARCH_FORM_HINT;
        }
    },

    init: function (aEvent) {
        var searchBox = document.getElementById('s');
        searchBox.addEventListener('focus', petrkolar.clearSearchFormHint, false);
        searchBox.addEventListener('blur', petrkolar.fillSearchFormHint, false);
    }
};

window.addEventListener('load', petrkolar.init, false);