trying to Change to wp_register_sidebar_widget

function widget_sidebarLogin() {
    echo "Content of Your Widget";
}

wp_register_sidebar_widget(
    'sidebarLoginId',        // your unique widget id
    'SidebarLogin',          // widget name
    'widget_sidebarLogin',  // callback function
    array(                  // options
        'description' => 'Some Descriptions'
    )
);