what you need to do is call a global variable, for example, ent_number and in the action for it, add these two lines:

ent_number += 1;
my.skill67 = ent_number;

you can use whatever skill you want, as long as you're not using it already in the current action/function. adding those few lines of code, will keep each entity with the same action from conflicting

Code:

---

var ent_number;

function anim_plantidle()
{
	ent_number += 1;
	my.skill67 = ent_number;
	var percent				=0;
	var animRate			=60;
	var animThresh			=99.5;
	if(my.flag1==1)
	{
		animRate				=plantAnimRate;
	}
	while(1)
	{
		percent				+=GetSeconds()*animRate;
		if(percent>=animThresh)
		{
			percent			=0;
		}
		ent_animate(my,"idle",percent,0);
		if(plantMode!=kPlantIdle)
		{
			return;
		}
		wait(1);
	}
}

---