This is largely educated guessing but try this.
WARNING - requires 7.71
Code:
BMAP  *resume0_bmp, *resume1_bmp;
PANEL *pause_pan;

void loadHUD()
{
   resume0_bmp = bmap_create("button_resumeOut.bmp");
   resume1_bmp = bmap_create("button_resumeOver.bmp");
   pause_pan = pan_create("bmap = screen_pause.tga;", _VAR(2));
   pause_pan->pos_x = _VAR(373);
   pause_pan->pos_y = _VAR(197);
   pause_pan->flags |= OVERLAY | TRANSLUCENT;
   pan_setbutton(pause_pan, _VAR(0), _VAR(2), _VAR(0), _VAR(0), resume0_bmp, resume0_bmp, resume1_bmp, resume1_bmp, NULL, NULL, NULL);
}



"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial