This function works when someone clicks on this link so he can choose one or more from these services, and the selected services will be shown in form result mail.
The URL does not work for me, so I cannot see how it was implemented.
But I do not think this is standard HTML functionality so you may need to create a script for this.
As Pablos reply I to couldn't access the url at first and had to use a vpn. Looking at the page and onselecting the image(s) they become highlighted. So in principal they are simply acting as a checkbox. It may be possible using events to achieve or seek a custom script.
See the following although not exactly as the url in principal it similar http://jcuenod.github.io/imgCheckbox/
or https://iqbalfn.github.io/bootstrap-image-checkbox/
@ BaconFries, that's exactly what I'm looking for https://iqbalfn.github.io/bootstrap-image-checkbox/ (Image Checkbox).
Is there any ways to achieve this thru WWB!! and how to get the selected images in form result email??