Javascript question

How do you add some content in a specific place in Javascript at the user's bequest? I'm writing a sort of CSS designer with the idea that it shows the user what the style looks like by writing it to a file and then loading it (using PHP). The thing is I want it to actually be useful, so it needs to be able to have as many elements and properties as the user wants. I know that trick where you have an empty <div> and set its innerHTML member but that will leave me a set number, and I don't want to just stick billions and billions of <div> tags inside my code (its already messy enough).

tl; dr how do I dynamically instert code into a webpage at a set position but allowing an arbitrary number of insertions?

>>23

you might want to try alert(blahblah.innerHTML) instead of using that if statement, as the empty string might not be null. I can never keep corner cases like this straight.