帮忙看一段代码是什么意思

[hlgchina]

if (isDjvu!=-1){
bookno=ebook.slice(-9,-1);
to_mask=bookno+pageId;
masked=hex_md5(to_mask).slice(0,8);
var urlOLD = ebook+pageId+".djvu?djvuopts&zoom="+zoom+"&toolbar=false&keyboard=yes";

djvuopts&zoom="+zoom+"&toolbar=false&keyboard=yes";

$.get("/djvu/get_mask/"+bookno+"/"+pageId+"/",function(data){
if(data == 'question') // need question
{
self.parent.document.getElementById("text").rows = "200px,*";
self.parent.frames[1].showQuestion();
}
else
{
self.parent.document.getElementById("text").rows = "45px,*";
var urlnew= ebook+pageId+data+".djvu?djvuopts&zoom="+zoom+"&toolbar=false&keyboard=yes";
var content=parent.document.getElementById("content");
content.src=urlnew;
}
});
}


请问这个urlnew最终的结果是什么
urlnew= ebook+pageId+data+".djvu?djvuopts&zoom="+zoom+"&toolbar=false&keyboard=yes";
主要是这里的data不知道那里来的

[awusoft]

function(data){
if(data == 'question') // need question
{
self.parent.document.getElementById("text").rows = "200px,*";
self.parent.frames[1].showQuestion();
}
else
{
self.parent.document.getElementById("text").rows = "45px,*";
var urlnew= ebook+pageId+data+".djvu?djvuopts&zoom="+zoom+"&toolbar=false&keyboard=yes";
var content=parent.document.getElementById("content");
content.src=urlnew;
}
}

data是那个参数啊