1. Let me explain the way I did it: When you want to select pictures to download, you have to click several times and focusing a small icon would make it long and difficult. That's why I set this action on the complete image.
But if you want to display an image (that means, switch to the slideshow mode), you just need to click one time in this icon, and you stay in the slideshow mode.

2. I tried to organize the page so that the entire image can be seen on a 1024x768 screen, on a standard Safari, with the search bar in 'simple' mode.
If you want a smaller image, you can edit wipha/main.php and change this line:

$­wipha->sendPhoto($­_GET['ph'], 640, 640);

The current 640, 640 are the maxWidth and maxHeight or the computed image resized to fit this maximum box while keeping the same ratio.