function showpr()
{
//alert('ds');
var prov=document.lianbo.province;
   prov.options.length =k+1;
 
    for (i=0;i<=k;i++)
    {
    prov.options[i].text = pr[i];
	prov.options[i].value = pr[i];
}
   prov.options[0].selected = true;

}

function provincedone(origin)
{

 var num = origin.selectedIndex;   thect = document.lianbo.city;

 if (num > 0)
 {
  {

   thect.options.length = ctn[num]+1

   thect.options[0].text = PlSelectCIty

    for (i=1;i<=ctn[num];i++)
    {

    thect.options[i].text =ct[ctc[num]+i-1];

    thect.options[i].value = ct[ctc[num]+i-1]

    }
 if (ctn[num] ==1) 
   thect.options[1].selected = true;
   else
   thect.options[0].selected = true;
  }

 }

}

showpr();