different logo on home page?

I am using hot_wellness successfully, and have customized a fair bit. I would like to add logic somewhere (perhaps in index.php?) that says:

if OnHomePage
show logo-home.png
else
show logo.png

Can it be done? Is there some value to check that says "I'm on the home page now"? I rather not have a duplicate copy of the template just for this.

When you have this in index.php, when you are on the front page, img tag will be otherwise, it will be

Actually, in the Wellness template, you should change logo line with

Great! Thanks!