$(document).ready(function(){
    var form = $("form#search");
    var input = $("input#search-field");
    var submit = $("#search-submit");
    submit.bind("click", function(event){
        if ($("form#search").hasClass("initial")) {
            event.preventDefault();
        }
    });
    input.focus(function(){
        if (form.hasClass("initial")) {
            this.form.q.value=''
        }
    });
    input.keyup(function(){
        if (input.val() == "") {
            form.addClass("initial");
        } else {
            form.removeClass("initial");
        }
    });
});