roboticus solution is far better than my suggestion.

But it does give me the excuse for a tangential observation: If your titles contain as many as 12 words (and some of them are l...o...o...n...g words) you're going to end up with a $filename that's terribly long -- if they average 4 chars per word and you're using a four digit year and a three letter month, that's a filename nearly 70 chars long (and heaven knows what a full path might look like).