Timing changes query

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DannyD

using

for the image.

This works:

Graphics 800,600,32
'load an image to tile
image=LoadImage("flake.png")

duration=500 'millisecs = 1/2 sec

dx=1
dy=1

timer=MilliSecs()

While Not KeyHit(KEY_ESCAPE)

	TileImage image,x,y

	'move the tiled background
	x=x+dx
	y=y+dy
	
	If MilliSecs()>timer+duration
	dx=-dx
	dy=-dy
	timer=MilliSecs()
	End If
	
	Flip;Cls

Wend

while this doesn't:

Graphics 800,600,32
'load an image to tile
Global image=LoadImage("flake.png")




While Not KeyHit(KEY_ESCAPE)

	function1()
	
	Flip;Cls

Wend

Function Function1()
TileImage image,x,y
duration=500 'millisecs = 1/2 sec
timer=MilliSecs()

dx=1
dy=1
	'move the tiled background
	x=x+dx
	y=y+dy
	
	If MilliSecs()>timer+duration
	dx=-dx
	dy=-dy
	timer=MilliSecs()
	End If

End Function

I don't know why ? Am I right in asserting flip and cls should only be called once within a program? Any ideas or tips ?