var areajs = Array();
areajs['selected'] = '';
areajs['1'] = Array();
areajs['1']['2'] = "海曙区"; 
areajs['1']['3'] = "江东区"; 
areajs['1']['4'] = "江北区"; 
areajs['1']['5'] = "镇海区"; 
areajs['1']['6'] = "北仑区"; 
areajs['1']['7'] = "鄞州区"; 
areajs['1']['8'] = "余姚市"; 
areajs['1']['9'] = "慈溪市"; 
areajs['1']['10'] = "奉化市"; 
areajs['1']['11'] = "宁海县"; 
areajs['1']['12'] = "象山县"; 
function ChangeSubSelect_areajs(tt,st){
figure = tt.value;
j = 0;
for(var key in areajs[figure]){
j++;
}
i = 0;
se_pd = 0
st.options.length = j+1;
i++;
for(var key in areajs[figure]){
st.options[i].text = areajs[figure][key];
st.options[i].value = key;
if(areajs["selected"] != key && se_pd == 0) {
st.options[0].selected = true;
} else if (areajs["selected"] == key) {
st.options[i].selected = true;
se_pd = 1;
}
i++;
}
}