wrappedtext: Word wrap class (that skips html tags)

If a site uses narrow tables this is a great tool because words that are longer as the width of a table would enlarge the table and deface the site layout. using php's wordwrap function has the disadvantage that the whole text is wrapped which means that short words might also get cut at a certain position of the line. in addition wordwrap can't be used if the text that needs to be wrapped contains html tags.