I bet this will end in yet another riot outside the Israeli embassy like the ones in January 2009 see this :  http://www.youtube.com/watch?v=jtr-6sWgTEE
I don't know how rioting will help your cause.

If you go to a protest about a massacre without enough passion to smash a few windows then you might as well not bother. FFS put some feeling into your life!
The only things that were wrong with the last demonstration was the fact that people did not cover their faces and that we did not get into the embassy. There will be enough of us. Look how brave those people on the boats where ( taking on commandos with sticks and bottles) thats the kind of passion you need to win. NO more flyers, speeches or stewards! we are angry and we wanna be heard!

Please wear black (so that people look the same and to commemorate the dead) cover your face. Dont back down to the police and always be ready to move! Bring a change of t shirt and if you are questioned jus be as nice as possible to the pigs, this is how you avoid jail time and do what has to be done.

Whether demonstrators smash windows or not is not a good measure of passion, especially where doing that is not going to have any effect on the issue being protested about.