Event.observe(window, 'load', function() {
    $('searchGadget').setStyle({color: '#888'});
    $('searchGadget').value = 'enter keyword';
    $('searchGadget').observe('click', function() {
        if ($('searchGadget').getValue() == 'enter keyword') {
            $('searchGadget').clear();
            $('searchGadget').setStyle({color: '#000'});
        }
    });
    $('searchGadget').observe('blur', function() {
        if (! $('searchGadget').present()) {
            $('searchGadget').setStyle({color: '#888'});
            $('searchGadget').value = 'enter keyword';
        }
    });
});