[OS X TeX] Using NATBIB to make a Harvard reference to a website

[George SINGER]

Can anyone help?
I'd like to use Bibtex to produce the following:
NHS Evidence, 2003. National Library of Guidelines. [online] Available at: <http://www.library.nhs.uk/guidelinesFinder> [Accessed 10 October 2009].
I attach a sample TEX file and associated .bib file which I've forced to sort of work.
Any help to do it properly, would be much appreciated.
George S 		 	   		  
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