[OS X TeX] Changing hIghlighting color in TexShop 2.47

[Schremmer Alain]

Yes, TexShop 2.47 is an antique but so am I and my vision is failing.

When I apple click on something in the pdf, TexShop very obligingly highlight the corresponding code in the source. (Sometimes in grey, sometimes in yellow.) My problem is that when the pdf window is large, I can't see the highlighting. For that I have to shrink the window.

I would like to change both colors to something more vivid that I would see well enough without having to shrink the window.

I haven't been able to find where I could do that. 

I looked around but I don't think even Schulz's TeXShop Tips & Tricks (v0.2.3–2011/01/07) mentions it.

I would very much appreciate any help.

--schremmer