function video_left()
{
	if(video_start == 0) return false;
	
	video_start--;	
	video_reset()
	
	return true;
}

function video_right()
{
	if(video_start + video_cells >= video_size) return false;
	
	video_start++;	
	video_reset();
	
	return true;
}

function video_reset()
{
	for(var i=0; i<video_size;i++)
	{
		elm = document.getElementById( 'video_item' + i );
		if(i < video_start || i >= video_start + video_cells)
		{
			elm.style.visibility = 'hidden';
			elm.style.position = 'absolute';
		} else
		{
			elm.style.visibility = 'visible';
			elm.style.position = 'relative';
		}
	}
}