不刷新得到下框列表框的值？？？特急啊！！！！
目的：
如： 选择国家 选择地区 选择市 提交


国家，地区或市数据库分别为，gj,dq,shi.

问：如果在我选择国家的时候，地区列表框中会得到所在国家的地区？市县同地区一样？

[解决办法]
<SCRIPT LANGUAGE= "JavaScript ">
<!--
function CreateSelect(_FormName,_SName,_SValue,_Ds,_AllOptionStr,ShowType)
{
//三级关链菜单通用版
//作者:海娃， 有问题请到http://www.51windows.Net留言。
if (_FormName== " ")
_FormName = "all "
var _DsArr = _Ds.split( "| ")
var _Ds1,_Ds2,_Ds3
var _Ds1 = _DsArr[0]
var _Ds2 = (_DsArr.length> 1)?_DsArr[1]:_DsArr[0]
var _Ds3 = (_DsArr.length> 2)?_DsArr[2]:_DsArr[0]

var _SNameArr = _SName.split( "| ")
var _SName1,_SName2,_SName3
var _SName1 = _SNameArr[0]
var _SName2 = (_SNameArr.length> 1)?_SNameArr[1]:_SNameArr[0]
var _SName3 = (_SNameArr.length> 2)?_SNameArr[2]:_SNameArr[0]

var _SValueArr = _SValue.split( "| ")
var _SValue1,_SValue2,_SValue3
var _SValue1 = _SValueArr[0]
var _SValue2 = (_SValueArr.length> 1)?_SValueArr[1]:_SValueArr[0]
var _SValue3 = (_SValueArr.length> 2)?_SValueArr[2]:_SValueArr[0]

if (ShowType==3){
_AllOptionStr = _AllOptionStr.replace(/\(\(/ig, "\(\( "+_Ds3+ "\^ ")
_AllOptionStr = _AllOptionStr.replace(/\{\{/ig, "\{\{ "+_Ds2+ "\(\( "+_Ds3+ "\*\* ")
}
else if(ShowType==2){
_AllOptionStr = _AllOptionStr.replace(/\{\{/ig, "\{\{ "+_Ds2+ "\(\( "+_Ds3+ "\*\* ")
}
else if(ShowType==1){
_AllOptionStr = _AllOptionStr.replace(/\(\(/ig, "\(\( "+_Ds3+ "\^ ")
}
var AllStr = _Ds1 + "{{ "+ _Ds2 + "(( "+ _Ds3 + "|| "+_AllOptionStr
//alert(AllStr)
var _AR0 = AllStr.split( "|| ");
document.writeln( " <select name=\ " " + _SName1 + "\ " size=\ "1\ " onChange=\ " "+_SName1+ "redirect(this.options.selectedIndex)\ "> ");
for (var i1 = 0;i1 < _AR0.length;i1++)
{
var Area1Str = _AR0[i1];
var _AR10 = Area1Str.split( "{{ ");
var _AR11 = _AR10[0].split( "@ ");
var Tstr1 = _AR11[0];
var Vstr1 = (_AR11.length==2)?_AR11[1]:_AR11[0]
document.writeln( " <option value=\ " "+Vstr1+ "\ "> "+Tstr1+ " <\/option> ");
}
document.writeln( " <\/select> ");

document.writeln( " <select name=\ " " + _SName2 + "\ " size=\ "1\ " onChange=\ " "+_SName1+ "redirect1(this.options.selectedIndex)\ "> ");
var _AR111 = _Ds2.split( "@ ");
var Tstr11 = _AR111[0];
var Vstr11 = (_AR111.length==2)?_AR111[1]:_AR111[0];
document.writeln( " <option value=\ " "+Vstr11+ "\ "> "+Tstr11+ " <\/option> ");
document.writeln( " <\/select> ");

document.writeln( " <select name=\ " " + _SName3 + "\ " size=\ "1\ "> ");
var _AR222 = _Ds3.split( "@ ");
var Tstr22 = _AR222[0];
var Vstr22 = (_AR222.length==2)?_AR222[1]:_AR222[0];
document.writeln( " <option value=\ " "+Vstr22+ "\ "> "+Tstr22+ " <\/option> ");
document.writeln( " <\/select> ");

document.writeln( " <S "+ "CRIPT LANGUAGE=\ "JavaScript\ " defer> ");
document.writeln( " <!-- ");
document.writeln( "var "+_SName1+ "NewAllStr = \ " "+ AllStr + "\ " ");
document.writeln( "var "+_SName1+ "_AR0 = "+_SName1+ "NewAllStr.split(\ "||\ "); ");
document.writeln( "var "+_SName1+ "groups=document. "+ _FormName + ". " + _SName1 + ".options.length; ");
document.writeln( "var "+_SName1+ "group=new Array( "+_SName1+ "groups) ");
document.writeln( "for (i=0; i < "+_SName1+ "groups; i++){ ");
document.writeln( " "+_SName1+ "group[i]=new Array(); ");
document.writeln( "} ");
document.writeln( "for (var i1 = 0;i1 < "+_SName1+ "_AR0.length;i1++){ ");
document.writeln( "var Area1Str = "+_SName1+ "_AR0[i1]; ");
document.writeln( "var _AR10 = Area1Str.split(\ "{{\ "); ");
document.writeln( "var _AR12 = _AR10[1].split(\ "**\ "); ");
document.writeln( "for (var i2 = 0;i2 < _AR12.length;i2++){ ");
document.writeln( "var Area2Str = _AR12[i2]; ");
document.writeln( "var _AR20 = Area2Str.split(\ "((\ "); ");
document.writeln( "var _AR211 = _AR20[0].split(\ "@\ "); ");
document.writeln( "var Tstr2 = _AR211[0]; ");
document.writeln( "var Vstr2 = (_AR211.length==2)?_AR211[1]:_AR211[0]; ");
document.writeln( " "+_SName1+ "group[i1][i2]=new Option(Tstr2,Vstr2); ");
document.writeln( "} ");
document.writeln( "} ");
document.writeln( "var "+_SName1+ "temp = document. "+ _FormName + ". " + _SName2);
document.writeln( "function "+_SName1+ "redirect(x){ ");
document.writeln( "for (m= "+_SName1+ "temp.options.length-1;m> 0;m--) ");
document.writeln( " "+_SName1+ "temp.options[m]=null; ");
document.writeln( "for (i=0;i < "+_SName1+ "group[x].length;i++){ ");
document.writeln( " "+_SName1+ "temp.options[i]=new Option( "+_SName1+ "group[x][i].text, "+_SName1+ "group[x][i].value); ");
document.writeln( "} ");
document.writeln( " "+_SName1+ "temp.options[0].selected=true ");
document.writeln( " "+_SName1+ "redirect1(0) ");
document.writeln( "} ");
document.writeln( "var "+_SName1+ "Group2s=document. "+ _FormName + ". " + _SName2 + ".options.length; ");
document.writeln( "var "+_SName1+ "Group2=new Array( "+_SName1+ "groups); ");
document.writeln( "for (i=0; i < "+_SName1+ "groups; i++){ ");
document.writeln( " "+_SName1+ "Group2[i]=new Array( "+_SName1+ "group[i].length) ");
document.writeln( "for (j=0; j < "+_SName1+ "group[i].length; j++){ ");
document.writeln( " "+_SName1+ "Group2[i][j]=new Array() ");
document.writeln( "} ");
document.writeln( "} ");
document.writeln( "for (var i1 = 0;i1 < "+_SName1+ "_AR0.length;i1++){ ");
document.writeln( "var Area1Str = "+_SName1+ "_AR0[i1] ");
document.writeln( "var _AR10 = Area1Str.split(\ "{{\ "); ");
document.writeln( "var _AR12 = _AR10[1].split(\ "**\ "); ");
document.writeln( "for (var i2 = 0;i2 < _AR12.length;i2++){ ");

document.writeln( "var Area2Str = _AR12[i2] ");
document.writeln( "var _AR20 = Area2Str.split(\ "((\ "); ");
document.writeln( "_AR212 = _AR20[1].split(\ "^\ "); ");
document.writeln( "for (var i3 = 0;i3 < _AR212.length;i3++){ ");
document.writeln( "Area3Str = _AR212[i3] ");
document.writeln( "_AR3 = Area3Str.split(\ "@\ "); ");
document.writeln( "Tstr3 = _AR3[0] ");
document.writeln( "Vstr3 = (_AR3.length==2)?_AR3[1]:_AR3[0] ");
document.writeln( " "+_SName1+ "Group2[i1][i2][i3]=new Option(Tstr3,Vstr3); ");
document.writeln( "} ");
document.writeln( "} ");
document.writeln( "} ");
document.writeln( "var "+_SName1+ "temp1=document. "+ _FormName + ". " + _SName3 + " ");
document.writeln( "function "+_SName1+ "redirect1(y){ ");
document.writeln( "for (m= "+_SName1+ "temp1.options.length-1;m> 0;m--) ");
document.writeln( " "+_SName1+ "temp1.options[m]=null ");
document.writeln( "for (i=0;i < "+_SName1+ "Group2[document. "+ _FormName + ". " + _SName1 + ".options.selectedIndex][y].length;i++){ ");
document.writeln( " "+_SName1+ "temp1.options[i]=new Option( "+_SName1+ "Group2[document. "+ _FormName + ". " + _SName1 + ".options.selectedIndex][y][i].text, " + _SName1 + "Group2[document. "+ _FormName + ". " + _SName1 + ".options.selectedIndex][y][i].value) ");
document.writeln( "} ");
document.writeln( " "+_SName1+ "temp1.options[0].selected=true ");
document.writeln( "} ");
document.writeln( "\/\/--> ");
document.writeln( " <\/script> ");
document.writeln( " <s "+ "cript language=\ "JavaScript\ "> ");
document.writeln( " <!-- ");
document.writeln( "function "+_SName1+ "SetValue(){ ");
document.writeln( "try{ ");
document.writeln( "if (\ " "+_SValue1+ "\ "!=\ "\ "){ ");
document.writeln( "document. "+ _FormName + ". "+_SName1+ ".value=\ " "+_SValue1+ "\ " ");
document.writeln( " "+_SName1+ "redirect(document. "+ _FormName + ". "+_SName1+ ".options.selectedIndex); ");
document.writeln( "if (\ " "+_SValue2+ "\ "!=\ "\ "){ ");
document.writeln( "document. "+ _FormName + ". "+_SName2+ ".value=\ " "+_SValue2+ "\ " ");
document.writeln( " "+_SName1+ "redirect1(document. "+ _FormName + ". "+_SName2+ ".options.selectedIndex) ");
document.writeln( "if (\ " "+_SValue3+ "\ "!=\ "\ ") ");
document.writeln( "document. "+ _FormName + ". "+_SName3+ ".value=\ " "+_SValue3+ "\ " ");
document.writeln( "} ");
document.writeln( "} ");
document.writeln( "} ");
document.writeln( "catch(e){ ");
document.writeln( "} ");
document.writeln( "} ");
document.writeln( "window.attachEvent(\ "onload\ ", "+_SName1+ "SetValue) ");
document.writeln( "\/\/--> ");
document.writeln( " <\/script> ");
}
//-->
</script>

[解决办法]
用xmlhttp好像可以？无刷新的读取服务器数据