This is a little plugin to make installing bookmarklets more understandable to ludites.
$('a.bookmarklet').bookmarklet();
An object can be passed in to customize the appearance of the arrow.
The options available are color, position and linewidth
$('a').bookmarklet({color: 'ff0000', position: 300, linewidth: 5})
You can see the plugin in action here: https://dschep.github.io/GistMarklets/