Trouble with responsivitizing my twentythirteen header

I'm using the twentythirteen theme and trying to get the header to adapt to screen resolution.

I've uploaded several image files with the required resolutions, and changed my custom-header.php source code according to what is suggested here.

The website, www.ensemblepourviroflay.org/wp/ (can't link more than twice with newbie account), does not seem to be displaying any of the images, at whichever resolution. I have pasted the content of my custom-header.php file here.

I would appreciate it if a kind stranger would have a look.

Topic theme-twenty-thirteen custom-header responsive Wordpress

Category Web

1
answered at

I think the paths to your images specified in custom-header.php aren't correct. You can use home_url() to specify this path if necessary, eg

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