private int GetIndexOfFirstBackMatterPage()
{
XmlElement firstBackMatterPage =
OurHtmlDom.RawDom.SelectSingleNode("(/html/body/div[contains(@class,'bloom-backMatter')])[position()=1]") as XmlElement;
if (firstBackMatterPage == null)
return -1;
return GetIndexOfPage(firstBackMatterPage);
}