/* Usage 
string test1 = StripTags("<p>George</p><b>W</b><i>Bush</i>", new string[]{"i","b"});
string test2 = StripTags("<p>George <img src='someimage.png' onmouseover='someFunction()'>W <i>Bush</i></p>", new string[]{"p"});
string test3 = StripTags("<a href='http://www.dijksterhuis.org'>Martijn <b>Dijksterhuis</b></a>", new string[]{"a"});

*/