I hate to be the bearer of bad news but you do know that you can't use other people's intellectual property. Warner Brothers owns all movie rights to and trademarks of the character Batman. Another writer a couple of months ago wanted to send his script to the WB as a writing sample and they are adamant about not taking unsolicited materials. They already have an established team of writers specifically for those movies and they can sue anyone who uses the character without their permission.

Frankly, I don't care. I'm just writing to write, if they have a problem I'll be glad to take it down. Till then, I shall continue to write on.

Instead of wasting your time on other people's ideas write your own. Your writing is good. You've got a good style and you seem to have gotten the basics down. Create your own material. You might go far if you do! If you're "Writing to write." don't waste your talent on somebody else's creations. You'll never go anywhere if you continue futzing around like this!!! And that's a Damn Shame!!!!