Most of the pics on MASS1961s link are bigger than 420 x 420 pxls and none are anywhere near 10MB. To make the pics smaller is easy.
The easiest would be to download the free Irfanview
http://www.irfanview.com/ and resize the pictures you want.
There are two way to resize an image. The easy common one is to simply reduce the pixel numbers in the Y and X plane, this also reduces the data size.
Another way is to keep the pixel no. and reduce/increase the physical size via cm/inch, this reduces the sharpness according to the reset size.
Have a go, it is easy when you've done it once.