cs_set_user_plant
Cstrike (cstrike.inc)
Description
cs_set_user_plant - Sets whether a player can plant the bomb.
Syntax
cs_set_user_plant ( index, [ plant = 1, showbombicon = 1 ] )
Type
Native
Notes
This will only work if the player is at a bomb site and has the bomb. You should use this if you give a player weapon_c4 manually.

If showbombicon is 1, the green C4 icon will be shown on the user's HUD.