Okay I got my site up and running and I'm happy (I'm not wanting to sell it or anything). Well now I just want to try and attract users so I want to make a banner that people could click on and it would take them to my site. Well at first I didn't even know the code then Jordan and he said it was this

<a href="url of site"><img src="url of img""></a>

but.. what goes in "url of img" does my banner already have to be online before I can use it? What do I do?