jQuery - help with porting to a plugin

just wondering if anyone could have a look at my code that ive been trying to port to a plugin. There seem to be no errors getting logged, I just cant work out not working (this is my first attempt at a jQuery plugin so I really don't quite know what I'm doing, even though I've done a lo开发者_StackOverflow社区t of work with the jQuery library).

Here is the original code (with comments):

http://jsfiddle.net/GZLQH/1/

And this is my attempt and a plugin:

http://jsfiddle.net/PnEYN/

Cheers

Charlie

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Here you go: http://jsfiddle.net/aGFdJ/4/

The main point:

• Since the this pointer does not always point to the original element, you need to store a reference to it somewhere.

Side notes:

• As experimentX noted in the comments, you need to reference jQuery.
• background:url(spark_01.png) is not going to work in jsFiddle.
• Consider using a for(var i = 0; i < sparks.length; i++) when looping over a array, instead of the for(var key in sparks).