function lastblock(sidebarName){		
	var searchColumn = document.getElementsByClassName(sidebarName)[0];		
	var sidebarBlocks = searchColumn.getElementsByClassName('block');
	if (sidebarBlocks.length > 0) {
		sidebarBlocks[sidebarBlocks.length-1].className += ' last-block';
	}
}
lastblock('col-right');