The fetus has the same intelligence and morals as the mosquito, and it thinks the same amount - it doesn't think at all. My friends, don't you see? It is not the body that matters, it is the soul. The soul will live on, even, as Crystal said, if the parents of this fetus are not able to raise that soul in that body, it may simply go back to God to await another body.
Leviticus 17:11 is referring to the law of kashrut in which man is not allowed to eat blood(one of the many laws, might I add, which Christians do not have to follow, therefore invalid arguing from a Christian standpoint). However, if you would like to use it, you still must take it in context - when referring this to eating, the Torah is basically comparing the consumption of blood to cannibalism, quite a different moral issue than abortion. In addition, if the abortion takes place in the first 28 days(approximately) there is no heart beating and therefore no blood flowing.
Of course, I too have major problems with people who use abortion as their method of birth control instead of trying hard to prevent this(although there aren't many of these people - an abortion is not a fun thing to go through), however, we must seperate our own moral beliefs from societies for the good of society. As I have previously stated, many more people would die from dangerous methods of abortions. Jewish law says that sometimes the highest law is the law of the land, and it should be upheld for the good of a greater society than one's own religious community. With this principle in mind, we should make this worldfer pace and not let our own morals get in the way of the true, living people worldwide.