Thanks for the reply. I dont like people make things for me, I like to learn and put that in practice. I only want someone to throw a light on me so I know what way I will take to achieving this. I already know How to create the multiple movieclips dynamically, and how to assign it a number
PHP Code:
for (var i=0i<=400i++){
    
mc+[i].loadMovie(myClips);
    
trace(mc+[i]+".jpg")
}
var 
myClips="thumb"+[i]+".jpg"
And also I can search in this forum how to load content from XML with loadvars (i've done this with a textfile).

But I need some light to know how to make this, in a way that can be easier for the search engine.

Also, how to create the empty clips, so there is a space/gap between each one like 10 or 15px. forming a grid as you said.