/*--------------------------------------------------
  INPUT  : toCheck  -> check data
  RETURN : true  -> IP address
           false -> not IP address
----------------------------------------------------*/
function jsCheckIp(toCheck)
{
     var chkstr = toCheck+"" ;
     var isIp = true ;

     if ( jsCheckNull(toCheck) )
          return false;

     for (j = 0 ; isIp && (j < toCheck.length) ; j++)
     {
          if ((toCheck.substring(j,j+1) < "0") || (toCheck.substring(j,j+1) > "9"))
          {
              if ( toCheck.substring(j,j+1) == "." )
                  if ( j == 0 )
                      isIp = false ;
              else
                  isIp = false ;
          }
     }

     return isIp;
}