遍历表单元素的问题！！

问题：
当第二个alert出现的时应显示menu2里的值的,可为什么会出现"undefined加上第一个meun1的值的,我要怎样才能得到第二个的值

<script language="JavaScript">
<!--
function check(){
var mykeys=new Array();
mykeys[0]="leafy";
mykeys[1]="aware";
mykeys[2]="age-related";
var answer=new Array();
for(var i=0;i<mykeys.length;i++) answer[i]="";
var every=zfl.elements ;
if (every.type="text"){
for(var i=0;i<10;i++){
var item=parseInt(every[i].name.substr(1))
answer[item]+=every[i].value;
alert(answer[item]+";");
}
}
</script>
</head>
<body>
<form name=zfl>
<input type="text" name="s0" class="inputline">
<select name="menu1" onchange="s0.value=menu1.options[menu1.selectedIndex].value">
<option selected>请选择答案</option>
<option value="leafage">A. leafage </option>
<option value="leaves">B. leaves</option>
<option value="leafy">C. leafy </option>
<option value="leafless">D. leafless</option>
</select><br>
<input type="text" name="s1" class="inputline">
<select name="menu2" onchange="s1.value=menu2.options[menu2.selectedIndex].value">
<option selected>请选择答案</option>
<option value="ware">A. ware</option>
<option value="aware">B. aware</option>
<option value="being aware">C. being aware</option>
<option value="aware of">D. aware of</option>
</select><br>
<input type="text" name="s2" class="inputline">
<select name="menu3" onchange="s2.value=menu3.options[menu3.selectedIndex].value">
<option selected>请选择答案</option>
<option value="greater">A. greater</option>
<option value="greatest">B. greatest</option>
<option value="great">C. great</option>
<option value="greatly">D. greatly</option>
</select>
</body>
</html>

---------------------------------------------------------------
晓月兄的回答：
js代码部分修改如下：

<script language="JavaScript">

function check(){
var mykeys=new Array();
mykeys[0]="leafy";
mykeys[1]="aware";
mykeys[2]="age-related";
var answer=new Array();
for(var i=0;i<mykeys.length;i++) answer[i]="";
var every=zfl.elements ;
if (every.type="text"){
           for(var i=0;i<10;i++){
                       var item=parseInt(every[i].name.substr(1));
                       answer[item]+=every[i].value;
                       alert(answer[item]+";");
           }
}
}
</script>

---------------------------------------------------------------
孟兄的回答：
<script language="JavaScript">
function check(){
var mykeys=new Array();
mykeys[0]="leafy";
mykeys[1]="aware";
mykeys[2]="age-related";
var answer=new Array();
for(var i=0;i<mykeys.length;i++) answer[i]="";
for(var i=0;i<document.zfl.elements.length;i++){
var every=document.zfl.elements[i];
if (every.type.toLowerCase()=="text"){
var item=parseInt(every.name.substr(1,1))
answer[item]=every.value;
alert(answer[item]+";");
}
}
}
</script>
</head>
<body>
<form name=zfl>
<input type="text" name="s0" class="inputline">
<select name="menu1" onchange="s0.value=menu1.options[menu1.selectedIndex].value">
<option selected>请选择答案</option>
<option value="leafage">A. leafage </option>
<option value="leaves">B. leaves</option>
<option value="leafy">C. leafy </option>
<option value="leafless">D. leafless</option>
</select><br>
<input type="text" name="s1" class="inputline">
<select name="menu2" onchange="s1.value=menu2.options[menu2.selectedIndex].value">
<option selected>请选择答案</option>
<option value="ware">A. ware</option>
<option value="aware">B. aware</option>
<option value="being aware">C. being aware</option>
<option value="aware of">D. aware of</option>
</select><br>
<input type="text" name="s2" class="inputline">
<select name="menu3" onchange="s2.value=menu3.options[menu3.selectedIndex].value">
<option selected>请选择答案</option>
<option value="greater">A. greater</option>
<option value="greatest">B. greatest</option>
<option value="great">C. great</option>
<option value="greatly">D. greatly</option>
</select>
<INPUT ONCLICK="check()" type="button" value="测试">
</body>
</html>