;(function($) {
    // plugin definition
    $.fn.overlabel = function(options) {
        // build main options before element iteration
        var opts = $.extend({}, $.fn.overlabel.defaults, options);
        var selection = this.filter('label[for]').map(function() {
            var label = $(this);
            var id = label.attr('for');
            var field = document.getElementById(id);

            if (!field) return;

            // build element specific options
            var o = $.meta ? $.extend({}, opts, label.data()) : opts;

            label.addClass(o.label_class);
 
            var hide_label = function() {label.css(o.hide_css)};
            var show_label = function() {this.value || label.css(o.show_css)};
 
            $(field)
                 .parent().addClass(o.wrapper_class).end()
                 .focus(hide_label).blur(show_label).each(hide_label).each(show_label);
            return this;
        });
        return opts.filter ? selection : selection.end();
    };
 
    // publicly accessible defaults
    $.fn.overlabel.defaults = {
        label_class:   'overlabel-apply',
        wrapper_class: 'overlabel-wrapper',
        hide_css:      {'text-indent': '-10000px'},
        show_css:      {'text-indent': '0px', 'cursor': 'text'},
        filter:        false
    };
})(jQuery);