geAddHilightBlockage

geAddHilightBlockage( 
g_hlSetId 
d_blockageId
)
=> g_hlObjectId / nil

Adds a blockage to a highlight set.

g_hlSetId	Database ID of the highlight set.
d_blockageId	The blockage Id.

g_hlObjectId	The blockage is added to the set.
`nil`	The blockage is not added to the set.