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@@ -2076,7 +2076,7 @@ var Reveal = (function(){
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var slideHeight = dom.background.offsetHeight;
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var verticalSlideCount = verticalSlides.length;
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- var verticalOffset = verticalSlideCount > 0 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
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+ var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
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dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
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