我弄了这样一段代码：
<script language="javascript" src="http://localhost/PCASClass.js"></script>
<fieldset style="padding:5px;">
<legend>省市区选择</legend>
请依次点选：<input name="myarea" type="text" id="myarea" onchange="document.add.myarea.value+=this.value">
<select name="province"></select>
<select name="city"></select>
<select name="area"></select><br>
</fieldset>
<script language="javascript" defer>
new PCAS("province","city","area","吉林省","白城市","大安市");
new PCAS("province1","city1","area1","吉林省","吉林市","龙潭区");
new PCAS("province2","city2","area2","江苏省","苏州市","沧浪区");
new PCAS("province3","city3","area3");
new PCAS("province4","city4","area4","江苏省");
new PCAS("province5","city5","area5","江苏省","苏州市");
new PCAS("province6","city6","area6","江苏省","苏州市","沧浪区");
</script>
现在录入框如下，怎样适时把选择的值传递到那个文本框里作为myarea的值?
我想通过这种方式实现省市区级联选择，不知道可行否？
js文件已经封装
上传以下图片：
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2007-07-21 16:17:25 
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