Image alpha, waitfor, and loops

[scriptless]

Hello, I wanted to start off by explaining what I am trying to accomplish.

I wanted to make a similar effect to the xbox360/ps3 notification system. For those of you who use "ubuntu" you may notice it too, uses a similar effect called "NotifyOSD".

What I am doing here is drawing a polygon, and replacing it with an image. However, I wanted to use GUI's but had several problems. I could not make a semi-transparent black window appear. I was using GuiWindowCtrl, GuiControl, and GuiShowImgCtrl. No sucess, so I turned to polygons.

The problem I am having is that I need the polygon (or gui if anyone can help with that) to fade in/out. I am stumped why this code would not work seeing as it looks correct to me at first glance. Maybe anyone else might have an idea what I am doing wrong.

PHP Code:

//#CLIENTSIDE
function onCreated() {
  with (findimg(4002) ) {
    this.xy2 = {screenwidth-275,25};
    this.xy = {temp.poly[0]+50, temp.poly[1]+25};
    polygon = {this.xy2[0],this.xy2[1],this.xy2[0]+250,this.xy2[1],this.xy2[0]+250,this.xy2[1]+75,this.xy2[0],this.xy2[1]+75};
    layer = 4;
    red=green=blue=25;
  }
  changeimgcolors(4002,0,0,0,.5);
  with (findimg(4003)) {
    this.xy2 = {screenwidth-215,35};
    x=this.xy2[0];
    y=this.xy2[1];
    layer = 5;
    text = "scriptless has logged on";
    zoom = .7;
  }
  with (findimg(4004)) {
    this.xy2 = {screenwidth-260,45};
    x=this.xy2[0];
    y=this.xy2[1];
    layer = 5;
    image = "head1212.png";
    zoom = 1.5;
  }
  changeimgpart( 4004, 0, 64, 32, 32 );
  
  for ( i=0; i<1; i+= .01 ) {
    for ( j=4002; j<4005; j++ ) {
      with (findimg(4002)) { alpha = i/100; }
    }
    waitfor("", "noevent", 0.5);
  }
} 


** Edit ***
I was unable to figure out how to change the polygons colors to black so i had to use a black image, stretch it and then change alpha. I know there must be an easier way but it just refused to work for me.
** end edit ***

Thank you in advanced,
scriptless

For solution click here.