FrameTarget
Attribute values of type FrameTarget must begin with a letter in the range A-Z or a-z, with the exception of the following special values that begin with an underscore:
_blank renders the link in a new, unnamed window
_self renders the link in the current frame (useful for overriding a BASE TARGET)
_parent renders the link in the immediate FRAMESET parent
_top renders the link in the full, unframed window