I need help for grouping a picture

Hi all,

 I need to group a picture ,caption in a page using Script .In this page there is 3 picture(blue,pink,yellow) , 3 caption like a,b,c. i need to group separate by separate like 
1) blue + A = Grouping
2)pink + B = Grouping
3)yellow +C=Grouping  
how to do Please help me ....