trying to us an old VGA power Mac monitor on my 2006 imac

I Thought I had a fix for my quickly dying imac. It's guts are fine but the LCD monitor has developed a form of computer tourets. I've just lost 1/3 of the screen. Tested it out to determine that my graphics card is fine but the monitor is not,

I have a spare vga monitor that I was using on a first generation powermac. I _thought_ i had found the proper connector (mini-dvi to VGA). Tried to connect them today but there's a problem: The pins don't match (the mini-dvi female end can't accept the male vga monitor plug as it's too big and has many more pins than it can accommodate).

HELP!!!!! Is there another adapter required? If so, what's the product number or name?