function busca_form(f) {
    if (f && f.query) {
        var q = f.query;
        var n = navigator;
        var l = location;
        var b = function() {
            if (q.value == '') {
                q.style.background = '#FFFFFF url(http:\x2F\x2Fidgnow.uol.com.br\x2Fimagens\x2Flogo_campo_busca.gif) left no-repeat';
            }
        };
        
        var f = function() {
            q.style.background = '#ffffff';
        };
        q.onfocus = f;
        q.onblur = b;
        if (!/[&?]q=[^&]/.test(l.search)) {
            b();
        }
    }
}