|¯¯¯¯¯|
 |aaaa |
 |bbb  |
 |     |
 |_____|

 |¯¯¯¯¯|
 |[img]|
 |sub  |
 |cccc |
 |_____|

How to make "cccc" automatically move up to fill the blank space on the first page?

* "a", "b" and "c" is just random text
* img is a large image
* sub is the image caption