$(document).ready ( function () {

    $("#searchbox input").focus( function() {

        $("#searchbox input").val('');

    }).blur( function () {

        $("#searchbox input").val('SØG HER');

    }).keyup( function (e) {

        if(e.keyCode == 13) {

            window.location.href='index.php?id=533&tx_indexedsearch[sword]=' + $("#searchbox input").val();

        }

    });

});