Drawing a simple line across the screen?

programming flash
1

Can someone help me draw a simple white, one pixel line across the middle of the screen at a moderate speed, with actionscript? Im having the hardest time.

I can draw a line with actionscript with

this.createEmptyMovieClip("line_mc", 10);
line_mc.lineStyle(1, 0xFFFFFF, 1000);
line_mc.moveTo(0, 0);
line_mc.lineTo(Stage.width, 0);
line_mc._x = 0;
line_mc._y = Stage.height/2;

But getting it to draw while the viewer is watching it is where Im stuck. Id like it to start at _x = 0 and _y = Stage.height/2 and go to _x = Stage.width at a speed of about 3 seconds.

Can anyone help me out? Thanks a million!
Rich