I want to place a logo I created into my header. Can anyone help me with that? I tried putting the image url in the h1 CSS, but it messed up entire site.

Here is my website: http://nkdogwalking.com
Here is the logo: http://www.nkdogwalking.com/nkdogwalking-logo.gif
Here is the CSS: http://www.nkdogwalking.com/style1.css

Feedback on the logo itself would be appreciated as well. I hope ralph.m sees this. He knows I've been meaning to get a log for a LONG time. I know it's pretty basic, but better than having nothing at all.