I have no idea about webcams but you may like to have a look at this site: http://lexicorient.com/tunisia/index.htm which gives a lot of information on all areas of Tunisia
From one Essex resident to another it's the least I could do If there's any other info you can't find on here don't hesitate to ask. I hope you have a lovely holiday. The Tej Marhaba is nicely situated for getting around the place.