Bad news is neither could I. No cables seem to be available or if they are i couln't find them.
I bought a box like the one you show but it was made by Grandtec and available through Amazon UK (the only uk site I could find it on). It works a on any monitor i have tried it on both CRT and LCD. You can also have your pc connected so you don't have to change leads. It has a remote so you can switch from the PC to the Wii. Only thing is it was £45.
The one you have looked at looks OK but its not too clear and i couldn't see the input and outputs. you just need to make sure the it has composite input to a VGA output