http://expert.csdn.net/Expert/TopicView1.asp?id=1238516

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    <script LANGUAGE="javascript"> 
    <!-- 
    var onecount; 
    onecount=0; subcat = new Array(); 
    subcat[0] = new Array("徐汇区","01","001"); 
    subcat[1] = new Array("嘉定区","01","002"); 
    subcat[2] = new Array("黄浦区","01","003"); 
    subcat[3] = new Array("南昌市","02","004"); 
    subcat[4] = new Array("九江市","02","005"); 
    subcat[5] = new Array("上饶市","02","006"); onecount=6; function changelocation(locationid) 

    document.myform.smalllocation.length = 0; var locationid=locationid; 
    var i; 
    document.myform.smalllocation.options[0] = new Option('====所有地区====',''); 
    for (i=0;i < onecount; i++) 

    if (subcat[i][1] == locationid) 

    document.myform.smalllocation.options[document.myform.smalllocation.length] = new Option(subcat[i][0], subcat[i][2]); 

    } } //--> 
    </script> <form name="myform" method="post"> 
    <select name="biglocation" onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)"> 
    <option value="01" selected>上海</option> 
    <option value="02">江西</option> 
    </select> 
    <select name="smalllocation"> 
    <option selected value="">==所有地区==</option> 
    </select> 
    </form>