Loop Animation with delay-variable

Hi everybody,
I want to play an animation continiously, but every time with delay between them. I know that corountines are not enabled in the Update-function because of certain performancing issues. However, my code do not work correctly ass it should:

public var delay : int = 15;

function Update () {
	Platform();
}

function Platform() {
	GetComponent(Animation).Play("Platform");
	yield new WaitForSeconds(delay);
}

The problem here is that it does not wait the WaitForSeconds-command, so the animation is looping straight after its end without any delay between it.

Any suggestions? Thanks in advance.

ok for one. you need to set a bool in there to turn on and off the function.
next your delay needs to be a loat and wrote like below
finally you need an animation length. Sorry I dont write java but this should be right!

public var delay : float = 15.0f;
public var animationLength: float;
var functionOn: bool;
 
 function Update () {
     Platform();
 }
 
 function Platform() {

if (functionOn == false)
{
     functionOn =true;
     GetComponent(Animation).Play("Platform");
     yield new WaitForSeconds (animationLength);
     GetComponent(Animation).Stop("Platform");

     yield new WaitForSeconds(delay);
     functionOn = false;
}

 }