Flash dynamic Fade actionscript

slides_array = new Array
(
  "swf/automated.swf",
 "swf/buyNow.swf",
 "swf/easy1.swf",
 "swf/money.swf"

 )

random_effects = new Array
(
  "zoomin",
  "zoomout",
  "pan_right",
  "pan_left"
)

trace(slides_array[0]);
slideNum = 0;
change_out_time = 5000;
fade_speed = 50;
slideLoaded = false;

trace( slides_array.length )


loadSlide();
function loadSlide()
{
loadMovie(slides_array[slideNum], window);
//call_changeout();
}
call_changeout();
function call_changeout()
{
 fade_out_interval = setInterval(call_fade_out_Slide, change_out_time);
}

function call_fade_out_Slide()
{
 fade_out_interval = setInterval(fade_out_Slide, fade_speed);
 trace("call_fade_out called");
}

function fade_out_Slide()
{
 trace(slideNum + " should fade");
 if(window._alpha > 0)
 {
  window._alpha -= 5;
 }
 else
 {
  clearInterval(fade_out_interval);
  call_nextSlide();
 }
}


function call_nextSlide()
{
 trace("call_nextSlide working");
 if(slideNum < slides_array.length -1)
 {
  slideNum++;
 }
 else
 {
  slideNum = 0;
 }
 loadSlide();
 window._alpha = 100;
}