function getKeyFrameIndexes(layer)
{
	var frames=layer.frames
	var numFrames=frames.length
	var indexes=[]
	for(var f=0;f<numFrames;++f)
	{
		cFrame=frames[f]
		indexes.push(f)
		if(cFrame.duration>1)
		{
			f+=cFrame.duration-1
		}
	}
	return indexes
}

var dom=fl.getDocumentDOM()
var timeline=dom.getTimeline()
var selectedLayers=timeline.getSelectedLayers()
var numSelectedLayers=selectedLayers.length
var layer, keyFrames, f, numKeyframes, cFrame, previousFrame
for(var l=0;l<numSelectedLayers;++l)
{
	layer=timeline.layers[selectedLayers[l]]
	keyFrames=getKeyFrameIndexes(layer)
	keyFrames.shift()
	numKeyframes=keyFrames.length
	for(f=0;f<numKeyframes;++f)
	{
		cFrame=layer.frames[keyFrames[f]]
		if(cFrame.labelType == "none" && cFrame.actionScript == "" && cFrame.soundName == "" && cFrame.elements.length == 0)
		{	previousFrame=layer.frames[keyFrames[f]-1]
			if(previousFrame.soundName == "" && previousFrame.elements.length == 0)
			{
				timeline.clearKeyframes(keyFrames[f])
			}
		}
	}
}