>Is it possible to determine the width of the picture by percent? This line is on my site: .
You 'can' do that, but it is not recommended. The best thing to do is actually resize the image using an image editor (photshop, paint shop pro, etc). Trusting the browser to 'do the right thing' is risky business... best to force it to:)
>Are there any specialized search systems for those who work with kids and teenagers within different organizations? ( e.g. local youth clubs, youth centres, “drop-in” centres etc).
Yes!!! The best way to find these places is to do searches yourself for them... for example: http://dir.yahoo.com/Society_and_Culture/Cultures_and_Groups/Teenagers/Organizations/
Hitting Yahoo and searching for "Youth Organizations" or "Youth Clubs" will bring you a huge listing of different types of youth clubs..... visiting the sites and EMailing them would be an excellent way to promote your games... Offering them a special offer would help even more ... "Hello, I was surfing your site today and noticed you offer yadda and yadda and yadda, I was so impressed I would like to offer you yadda and yadda as my thanks...." etc....
You may also want to look at http://dir.yahoo.com/Society_and_Culture/Cultures_and_Groups/Teenagers/Web_Directories/
As you surf you'll begin to see areas that you can list yourself in a more targetted way.
Hope this helps
p.s. it seems you are learning quite a bit -- G'Job!