I am trying to display what was selected on a text select list by the initial user, and I am allowing multiple values. So, how would I add in a comma inbetween the different values selected?

Another thing which I'm assuming I could figure out once I have that - I am making all the information that the person entered appear bold using span tags so far. In order to continue this, I'd have to have this string of characters inbetween the values:
</span> , <span style='font-weight: bold'>
Thus, I'd like it to skip putting it at the start or at the end of the list of values as well.

Thanks in advance for any help provided.