( 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 );