$(document).ready(function() {
    $('#tips dl dt').click(function(){
        toggle(this);
    });

});

function toggle(ele){
    var title = $(ele);
    var detail = $(ele).next('dd');
    if(detail.css("display") == "block") {
        detail.hide();   
    }
    else {
        detail.show().css("display", "block");
    }
    
    title.toggleClass('on');
}