function addExpanders() {
	var oBlocks = document.getElementsByClassName('preview')
	oBlocks.each(
		function(oBlock) {
			switch (oBlock.nodeName.toLowerCase()) {
				case 'ul':
				case 'ol':
					new ListExpander(oBlock, 4)
					break
				default:
					new TextExpander(oBlock)
					break
			}
		}
	)
	var oBlocks = document.getElementsByClassName('previewLong')
	oBlocks.each(
		function(oBlock) {
			new TextExpander(oBlock, 330)
		}
	)
}