Check if npc exist

[badneko]

Hi guys, im looking for a method to check of npc exist/enable/visible.

and when not not exit/disable/invisible.

 

i tried with getmapxy, 

if (getmapxy(@mapname$,@mapx,@mapy,1,"Silvia Summers#clic1")!=0){ percentheal -99,-99;end;}