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This tutorial is to answer on two questions:
1. How make actor blink without making additional animation frames ?
2. How make text actor blink? Text actors can not have animation at all...

Well, it's simple. First, let's see how to play with transparency.
All you have to do is to insert following code into actors "Draw Actor" function

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double  Base;        // base value of transparency, between  0..1
int     Frequency;   // Frequency of blinking, must be >1
double  Amplitude;  // how much trancparency will change.

// of cause you can declare these variables in global code instead of local procedure
// Normally:
// Base+Amplitude<=1
// Base-Amplitude>=0
 
Base=0.5; 
Frequency=8;
Amplitude=0.5;

transp=1-(Base+cos(degtorad(frame)*Frequency)*Amplitude);

Actor will blink.
As you can see, all based on cos function. Changing Base, Frequency, Amplitude values you can adjust your actor's blinking.
Note, that

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transp=1-(Base+cos(degtorad(frame)*Frequency)*Amplitude)

string is for initial transparence 0;
Code

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transp=Base+cos(degtorad(frame)*Frequency)*Amplitude;

string is for initial transparence 1;

The second case is "color-changing" blinking. In this case we have to work with r,g,b values of actor. Insert into "Draw Actor" function next code:

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int  Base_R,Base_G,Base_B;       // base value of transparency, between  0..255
int  Frequency_R,Frequency_G,Frequency_B;  // Frequency of blinking, must be >1
int  Amplitude_R,Amplitude_G,Amplitude_B;  // how much value will change.

// Normally:
// Base+Amplitude<=255
// Base-Amplitude>=0
 
 
Base_R=128;
 Base_G=128;
  Base_B=128;
 
Frequency_R=16;
 Frequency_G=16;
  Frequency_B=16;

Amplitude_R=128;
 Amplitude_G=128;
  Amplitude_B=128;

r=Base_R+cos(degtorad(frame)*Frequency_R)*Amplitude_R;
g=Base_G+cos(degtorad(frame)*Frequency_G)*Amplitude_G;
b=Base_B+cos(degtorad(frame)*Frequency_B)*Amplitude_B;

Actor will fade to black and return to normal condition again and again.
Changing initial values of variables will help you to get different effects

Have fun !

Thanx Leif. In your code..

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transp=1-(Base+cos
(degtorad
(frame)*Frequency)*Amplitude);


What does the "(frame)" mean?

frame: Game frame count. This variable is global and read only.

See here http://game-editor.com/docs/script_reference.htm

It means, that game counts all frames. And we can use it.

Excellent

Ah thank ya