function showLoginForm(){
new Effect.Parallel([new Effect.BlindUp($("loginBtn")),new Effect.BlindDown($("loginform"))],{afterFinish:function(){
Form.Element.focus("f_email");
}});
};
function hideLoginForm(){
new Effect.Parallel([new Effect.BlindDown($("loginBtn")),new Effect.BlindUp($("loginform"))],{afterFinish:function(){
$("f_email").value="";
$("f_password").value="";
}});
};