Little Video Advice Needed

[Suchy]

I often take my camcorder to concerts. But the lighting effects become very blurry and not in focus like this:

http://img243.imageshack.us/img243/2069/l10ve.jpg
http://img184.imageshack.us/img184/4478/l24iy.jpg

So what kind of lense should I get so the lighting effects will come out like this:

http://www.fordjsonly.com/images/Cgemfx.jpg

:confused:

Great thanks in advance