toggleOpacity.js

// toggle opacity for jQuery. toggles opacity between 1.0 and the specified value.
//
// usage:
//
// jQuery(selectory).toggleOpacity();
// jQuery(selectory).toggleOpacity({speed:"slow"});
//
//
// http://drawohara.com/post/205626543/jquery-toggleopacity
jQuery.fn.extend({
  toggleOpacity: function(opts){
    var e = jQuery(this);
    opts = opts ? opts : {};
    e.data('opacityMin', (e.data('opacityMin') || opts.max || (e.css('opacity')/3)));
    e.data('opacityMax', (e.data('opacityMax') || opts.min || e.css('opacity')));
    e.data('opacitySpeed', (e.data('opacitySpeed') || opts.speed || 'fast'));
    if(!e.data('toggleOpacity')){
      e.fadeTo(e.data('opacitySpeed'), e.data('opacityMin'));
      e.data('toggleOpacity', true);
    } else {
      e.fadeTo(e.data('opacitySpeed'), e.data('opacityMax'));
      e.data('toggleOpacity', false);
    }
  }
});