$(function(){
	var last = 0;
	var target = $('.boxContentText .dida');
	target.css('display','none');
	$(target.get(0)).css('display','block');			
	$('.boxListNav li a').mouseover(function(){
			var index = $('.boxListNav li a').index(this);
			$(target.get(last)).css('display','none')			
			$(target.get(index)).css('display','block');											 
			last = index;
    });
});