function changeText() {
    var doc = document.getElementById('query');
    if (doc.value == "...buscar") {
        doc.value = ""
        doc.className = "search_selected";
    }

}

function ReturnText() {
    var doc = document.getElementById('query');
    if (doc.value == "") {
        doc.value = "...buscar"
        doc.className = "search_unselected";
    }
}

function ShowLogin() {
    var doc = document.getElementById('Login1');
    if (doc.style.visibility.toLowerCase() == 'hidden') 
    {
        doc.style.visibility = 'visible';        
    }
    else
    {
        doc.style.visibility = 'hidden';
    }
}