kwebdesktop does its magic by taking a picture of the web page and saving it as a .png file. None of the web links are clickable because there are no links!
Instead of kwebdesktop, you need a real browser. Try this:
kstart --skiptaskbar firefox
http://comptune.com
or
kstart --skiptaskbar --fullscreen --alldesktops \
--keepbelow --display :0.1 \
firefox
http://comptune.com
for more info:
kstart --help-all