bitmap constraint issue

All,

I am trying to make a "sliding" effect for several bitmaps. I am just looping over them and either increasing or decreasing their x pos. I am trying to figure out a way to constrain it such that 5 bitmaps will always be visible.

Here is the code so far

$Slide = 0;
function NextPrevBmp(%val)
{

		clientCmdClear();
		if (%val>0)
		{
			for(%i = 0; %i < $NUM_SLOTS; %i++)
			{
				%j = %i + $Slide;
				if( %j > 9)  {
					%j -= 10;
				}
				
				$VISITEMS[%i] = $MYITEMS[%j];
				
				%item1 = $MYITEMS[%i];
				%posX = getWord(%item1.getPosition(),0) - 56;
				%posY = getWord(%item1.getPosition(),1);
				%item1.Position = %posX SPC %posY;
       
			}
		}
		else
		{
			for(%i = 0; %i < $NUM_SLOTS; %i++)
			{
				%j = %i + $Slide;
				if( %j > 9)  {
					%j -= 10;
				}
				
				$VISITEMS[%i] = $MYITEMS[%j];
				
				%item1 = $MYITEMS[%i];
				%posX = getWord(%item1.getPosition(),0) + 56;
				%posY = getWord(%item1.getPosition(),1);
				%item1.Position = %posX SPC %posY;	
			}
		}
			$Slide++;
			
			if( $Slide > 4) 
			{
				$Slide = 0;
			}
			echo("=>" SPC $Slide);
}

Can you think of a way to ensure that 5 bitmaps are displayed at all times? Right now I have a 290x64 guicontrol that they reside in.

-Ron