Grab the nearest book.
* Open it to page 56.
* Find the fifth sentence.
* Post the text of the next few sentences.
* Don't dig for your favorite book, the cool book, or the intellectual one: pick the CLOSEST.

For a cross-class skill, maximum rank is half the maximum for a class skill.
If a skill is unavailable to a class (that is, if it's an exclusive skill that a multiclass character's other class doesn't have access to), then levels in that class don't increase the multiclass character's maximum ranks. For instance, the 7th-level rogue/4th-level wizard would have a maximum rank of 10 in Use Magic Device, an exclusive class skill for rogues.

...Yeeeap.