function aClass(Pid, Cname) {
        if (aClass.arguments.length < 2)
                alert("传入的参数错误！")
        else {
                this.Data  = Pid;
                this.Text  = Cname;
        }
}
function chgbox(aSrc, aDes, aClass, aRemain){
        if (chgbox.arguments.length < 3)
                alert("传入的参数错误！")
        else if (aSrc.type != "select-one")
                alert("传入的参数错误！")
        else if (aClass == null)
                alert("aClass未定义错误！")
        else {
                if (aRemain==null)
                        aRemain = 1;
                chgItem(aSrc.options[aSrc.selectedIndex].value, aDes, aClass, aRemain);
        }
}
function chgItem(aValue, aDes, aClass, aRemain){
        if (chgItem.arguments.length<3)
                alert("参数传入错误！")
        else if (aClass==null)
                alert("错误！aClass没有定义！")
        else{
                if (aRemain==null)
                        aRemain = 1;
                deleteAllItem(aDes, aRemain);
                for (var i=0; i<aClass.length; i++)
                        if (aClass[i].Data==aValue)
                                if (aClass[i].Data!="")
                                        addItem(aDes, aClass[i].Text, aClass[i].Text);
        }
}
function deleteAllItem(aList, aRemain) {
        if(aList==null) return;
        for (var i=aList.options.length; i > aRemain-1; i--)
                aList.options[i] = null;
}    

function addItem(aList, aText, aValue) {
        var aOption = new Option(aText, aValue);
        eval("aList.options[aList.options.length]=aOption");
}
function change_area(aForm) {
        chgbox(aForm.province, aForm.city, f_Set0 , 0);
}
function getcityindex(province,cityname){
        var j=0;
        for (var i=0; i<f_Set0.length; i++){
                if (f_Set0[i].Data==province){
                        j++;
                        if (f_Set0[i].Text==cityname)
                                return j-1;
                }
        }
        return 0;
}

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