Javascript code for Mac address validation

Verification rules:

1. Broadcast MAC address (FF:FF:FF:FF: FF:FF:FF:FF)

2. IPv4 & IPv6 multicast MAC address

3. The Numeric character

Code list:

function isValidMacAddress(address) {  
   var c = '';  
   var i = 0, j = 0;  

    if ((address.toLowerCase() == 'ff:ff:ff:ff:ff:ff') || (address.toLowerCase() == '00:00:00:00:00:00')) {  
         alert('error');  
         return false;  
   }  

   var addrParts = address.split(':');  
   if (addrParts.length != 6) {  
       alert('error');  
        return false;  
   }  
   for (i = 0; i < 6; i++){  
        if (addrParts[i] == ''){  
             alert('error');  
             return false;  
        }  
   }  

   if (addrParts[i].length != 2) {  
        alert('error');  
        return false;  
   }  
   for (j = 0; j < addrParts[i].length; j++) {  
        c = addrParts[i].toLowerCase().charAt(j);  
        if ((c >= '0' && c <= '9') || (c >= 'a' && c <='f')) {  
             continue;  
        } else {  
             alert('error');  
             return false;  
        }  
   }  

   if ((parseInt(addrParts[0], 16) % 2) == 1) {  
        alert('error');  
        return false;  
   }  

   return true;  
}