I hav fixed this prob....
wat i did was .....

1st of all, I removed each and every file related to limewire frm the mac,
then i updated my java to the latest version through 'software update',
then nxt i downloaded and installed the limewire frm its website...
and it is working perfectly.

dat means the mess was with the java version which u ned to update to the latest version..... I hope this solution works 4 u all!!!!!!!