[Flash CS3/AS2.0] Dynamically loaded MovieClips and instance names

Help please!! I am using attachMovie in a for(var i=1; i<50; i++) loop.
Everything loads fine, but I am having difficulty referencing the dynamically created instance names. I don’t want to reference individually ie movieclip1, movieclip2 etc. but more by movieclip*. Is this possible anyone?

Basically - if movieclip instance 1 is rolled over I want to display image 1, and so on?

Thank you for any help