MS render problem

   I customized the MS material rendering template using photographs, which photographs I downloaded from the Internet. After I customized it, I exported it to the .mat template, but after I imported it on other computers, the material of my customized template is displayed as missing material, so I can't use the customized template. I wonder if I downloaded the image and didn't have it in the new computer. I imported the material file of the entire template into the It is copied and replaced, but the result is still the same. What's the problem? What's the normal way?Which teacher can help me out?

 thanks very much!