$(document).ready(function() {
	$('#topic_content').focus(function(){
		var obj = $(this);
		if(obj.height() != '150')
		{
			obj.css('height', '150px');
			$('.post_topic_tip').css('visibility', 'visible');
			$('.post_topic_cancel').css('visibility', 'visible');
		}
	});
	
	$('.post_topic_cancel').click(function(){
		$('#topic_content').css('height', '40px');
		$(this).css('visibility', 'hidden');
		$('.post_topic_tip').css('visibility', 'hidden');
		return false;
	});
	
});