private void SwapTags()
{
string[] tagsToFind = { "<h2", "</h2", "<h3", "</h3", @" title=""null""" };
string[] tagReplacments = { "<h4", "</h4", "<h5", "</h5", "" };
for (int i = 0; i < tagsToFind.Length; i++)
{
centerContent = centerContent.Replace(tagsToFind[i], tagReplacments[i]);
}
}