Here's a recipe from the recipe section that you could modify to include the lime. It's one of Carol's recipes. She posts them at www.allrecipes.com too which another place you might check.
http://www.cakecentral.com/cake_recipe-722-35-Lemon-Jelly-Filling.html
Depending on how much time I have, I either make lemon curd or buy Dickinson's. Sometimes I use it by itself, sometimes mix with buttercream for a milder lemon flavor (makes it go further too since it's a little expensive.)
They also make lime, you could mix the 2.
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