function GetJumpPointItemNo(id: Integer): Integer;
Warning: do not use this function for document containing tables. When the link is in table cell, or in cell inplace-editor, it can not be addressed using only an index of item. Use GetJumpPointLocation instead.
id – identifier of the hypertext link; links are numbered sequentially starting from FirstJumpNo.
Index of the hypertext item (in range 0..ItemCount-1). If there is no link with such id, the method returns -1.
Note: this function contains some calculations inside (iterations through hyperlinks, from the first link to the requested one)