How To add a pdf icon in Sharepoint sites

So, Why not pdf icons are included in sharepoint?
Let the answer be unspoken.
but how to add that, so when we create a doccument library, icon will appear when we upload a pdf file?

So here we go with steps.

1)Copy pdf_smallicon from adobe site.
2)Open 12\Template\Images folder
3)Paste it in that.
4)open Docicon.xml file which is over here : 12\Template\XML\Docicon.xml
5)Go to tag
6)Add this

<mapping key="pdf" value="pdficon_small.gif"> 
<mapping key="accdt" value="icaccdb.gif"> 
<mapping key="accdc" value="icaccdb.gif"> 
<mapping key="asax" opencontrol="" value="icasax.gif">

7)Thats all, go ahead upload any pdf file now and see the magic...