Adding a logo (only for mobile Devices)

Hi,

I would like to add a logo image to the top and center of the page (when viewed on mobile devices) the logo that is currently visible on the computer browser is emended into the menu and that is disabled on the mobile devices due to breaking the menu layout. which is why i wanted to insert another logo through the theme or header ( which Michael suggested earlier) and restrict that to be viewed only by mobile devices - if possible ?
When trying to add this it seems to have no effect neither on computer browser or mobile browser. if someone can please take a look into this for me i would really appreciate it.

I have enabled support access.
*URL(S) REMOVED*

Thanks

Tom