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function selectTradezone(){
    var copyTradezone = document.forms[0].copyTradezone;
    new BaseTool().ajax("getTradezoneByCity",callback,[document.forms[0].city.value,document.forms[0].brand.value]);
   
    function callback(json) {
        if(json.length > 0){
            copyTradezone.options.length = 0;
            var firstOpt = new Option();
            firstOpt.text = '--ÇëÑ¡Ôñ--';
            copyTradezone.add(firstOpt);
            for(var t=0; t<json.length; t++){
                var opt = new Option();
                opt.value = json[t].ROW_ID;
                opt.text = json[t].TRADEZONE_NAME;
                opt.desc = json[t].TRADEZONE_TYPE + ',' + json[t].TRADEZONE_REMARK + ',' + json[t].NWP_MEMBER;                            copyTradezone.add(opt);
            }
        }
    }
}
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<yum:ajaxselect name="Page11_301Form" property="copyTradezone" describe="¿½±´ÉÌȦ" onmouseover="showTips(this)" onmouseout="oPopup.hide()" styleClass="input" style='width:130px;' onchange="fill(this.options[this.selectedIndex].desc)
"></yum:ajaxselect>


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<form id="form1" name="form1" method="post">
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