I can see that my reply could be misunderstood, sorry.
I did not exactly know what you meant, but finally got it to work using this trick: http://shaybocks.com/add-logo-header-foodie-pro-theme/
Thanks a lot anyway!
Thank you for your response. This is my website: http://urlgone.com/9cb4a0/
And here you can see the image files: Link to regular size: http://urlgone.com/4688a7/ Link to @2x double size: http://urlgone.com/cdcb5d/
Both online and working. Thanks for the help