using URL of images uploaded to domain host in HTML

I'm trying to use certain images on my web site, but clearly have not used the correct URL in the HTML/CSS to access the images I uploaded to a directory called 'logos' to my web host account, where as all the HTML/CSS files are in the 'public_html' directory. What's the correct url to use?

I tried asking the technical support from my web host and I don't think they understood my question...

Thanks everyone!