<script> function parseIp6(str)
{ //init  var ar=new Array;  for(var i=0;i<8;i++)ar[i]=0;  //check for trivial IPs  if(str=="::")return ar;  //parse  var sar=str.split(':');  var slen=sar.length;  if(slen>8)slen=8;  var j=0;  for(var i=0;i<slen;i++){    //this is a "::", switch to end-run mode    if(i && sar[i]==""){j=9-slen+i;continue;}    ar[j]=parseInt("0x0"+sar[i]);    j++;  }   return ar; }
function ipcnvfrom6(ip6)
{ var ip6=parseIp6(ip6);  var ip4=(ip6[6]>>8)+"."+(ip6[6]&0xff)+"."+(ip6[7]>>8)+"."+(ip6[7]&0xff);  return ip4; }
alert(ipcnvfrom6("::C0A8:4A07")); </script>