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Personally, I would do something like this:

PHP Code:

//#CLIENTSIDE
function onPlayerEnters(){
  setEffectMode(1);
  setColorEffect(1, 1, 1, 1);
  dontBlockLocal();
  drawOverPlayer();
  setTimer(0.05);
}

function onTimeout(){
  if (player.x+1.5 in |this.x-1, this.x+this.width+1| && player.y+2 in |this, 37|){
    setColorEffect(1, 1, 1, 0.7);
  } else {
    setColorEffect(1, 1, 1, 1);
  }
  setTimer(0.05);
} 


Then you can put it in a class and use it for other things like it.