function loginSubmit(form){return new Ajax.Request('/user/login',{method:'post',parameters:{username:form.username.value,password:form.password.value},onSuccess:function(transport){$('loginBlock').update(transport.responseText);}});}
function logoutSubmit(form){return new Ajax.Request('/user/logout',{method:'post',parameters:{logout:true},onSuccess:function(transport){$('loginBlock').update(transport.responseText);}});}