如何动态的添加JS代码的问题

for(i=0;i //
if(i2){
title[i].setAttribute("id","fourthly"); //为第四个标题添加id
if(i season[i].setAttribute("id","fourthlyContent"); //为第四个剧集添加id
$("#fourthlyContent").css("display","none"); //隐藏内容
}
$("#fourthly").live('click',function(){
$("#fourthlyContent").toggle();
});
}else if(i1){
title[i].setAttribute("id","thirdly"); //为第三个标题添加id
if(i<slen&&i!=0){ //获取对应的剧集
season[i].setAttribute("id","thirdlyContent"); //为第三个剧集添加id
$("#thirdlyContent").css("display","none"); //隐藏内容
}
$("#thirdly").live('click',function(){
$("#thirdlyContent").toggle();
});
}else if(i!=0){
title[i].setAttribute("id","second"); //为第二个标题添加id
if(i<slen&&i!=0){ //获取对应的剧集
season[i].setAttribute("id","secondContent"); //为第二个剧集添加id
$("#secondContent").css("display","none"); //隐藏内容
}
$("#second").live('click',function(){
$("#secondContent").toggle();
});
}else{
title[i].setAttribute("id","firstly"); //为第一个标题添加id
season[i].setAttribute("id","firstlyContent"); //为第一个剧集添加id
$("#firstlyContent").css("display","none"); //隐藏内容
$("#firstly").live('click',function(){
$("#firstlyContent").toggle();
});
}

}
}

第三和第四个标题的那个if应该是要动态添加进去的，因为后续可能有更多的第五第六个，现在我要动态添加

if(i1){
title[i].setAttribute("id","thirdly"); //为第三个标题添加id
if(i<slen&&i!=0){ //获取对应的剧集
season[i].setAttribute("id","thirdlyContent"); //为第三个剧集添加id
$("#thirdlyContent").css("display","none"); //隐藏内容
}
$("#thirdly").live('click',function(){
$("#thirdlyContent").toggle();
});
}else

这个JS代码，每加一段，if内的判条件的数字就+1，id也要替换，请问这个怎么做？