Can you use multiple conditions in a for loop?

For example, I am trying to attach images 1-6 to a specific movieclip, and images 7-12 to another and so on.

So my logic was to do this:

for (i=1; i<=6; i++) {
container.attachMovie("thumb"+i,"thumb"+i+"_mc",i) ;
}

for (i=1: i>6 && i<13; i++) {
container2.attachMovie("thumb"+i,"thumb"+i+"_mc",i );
}

But it's not working. Ony the top loop works.

Can someone clarify how it should be done?

Katie