javascript在线测试题实现不了提交功能？

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<title>名词单元练习</title>
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<script language=javascript>var NowID;function Sub2(){
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i=0;
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<a id="danyuan" href="11" class="a2">Unit 1 名词</a></div>
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<p class=t1>I. 用所给词的适当形式填空。</p>
<p class=t2>1.There are some <input type=text size=8 name=kong0><span class=t5 id=pan0></span><span class=t4 id=zheng0></span><textarea rows=0 name=daan0 cols=0 style='visibility:hidden;width:1;height:1'>potatoes</textarea> (potato)in the basket.</p>
<p class=t2>2.Look! There are a lot of <input type=text size=6 name=kong1><span class=t5 id=pan1></span><span class=t4 id=zheng1></span><textarea rows=0 name=daan1 cols=0 style='visibility:hidden;width:1;height:1'>leaves</textarea> (leaf)on the ground.</p>
<p class=t2>3.I have two <input type=text size=6 name=kong2><span class=t5 id=pan2></span><span class=t4 id=zheng2></span><textarea rows=0 name=daan2 cols=0 style='visibility:hidden;width:1;height:1'>knives</textarea> (knife).</p>
<p class=t1>II. 选择最佳答案填空。</p>
<p class=t2>1.This is not your radio， but<input type=text size=1 name=kong18 readonly=readonly><span class=t5 id=pan18></span><span class=t4 id=zheng18></span><textarea rows=0 name=daan18 cols=0 style='visibility:hidden;width:1;height:1'>B</textarea>.</p><p class=t3><span onclick='subdaan(kong18,0);' style='cursor:hand'>A. yours brother</span>&nbsp;&nbsp;<span onclick='subdaan(kong18,1);' style='cursor:hand'>B. your brother</span>&nbsp;&nbsp;<span onclick='subdaan(kong18,2);' style='cursor:hand'>C. you brother</span>&nbsp;&nbsp;<span onclick='subdaan(kong18,3);' style='cursor:hand'>D. yours brother</span>&nbsp;&nbsp;</p>
<p class=t2>2.September 10th is<input type=text size=1 name=kong19 readonly=readonly><span class=t5 id=pan19></span><span class=t4 id=zheng19></span><textarea rows=0 name=daan19 cols=0 style='visibility:hidden;width:1;height:1'>D</textarea>Day.    </p><p class=t3><span onclick='subdaan(kong19,0);' style='cursor:hand'>A. Teacher</span>&nbsp;&nbsp;<span onclick='subdaan(kong19,1);' style='cursor:hand'>B. Teachers</span>&nbsp;&nbsp;<span onclick='subdaan(kong19,2);' style='cursor:hand'>C. Teacher</span>&nbsp;&nbsp;<span onclick='subdaan(kong19,3);' style='cursor:hand'>D. Teachers</span>&nbsp;&nbsp;</p>
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<a href="#" class="a1" onclick="javascript:Sub2();">提交</a>&nbsp;
<a href="#" class="a1" onclick="javascript:layer1.innerHTML =s[NowID];">重做</a>&nbsp;
<a id="aback" href="" class="a1">返回</a></div>
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