About database i can't say becasue you should know what is the name of the table you are using

errors
it seems that the names you are using in $_GET[] are not proper and the ydon't exist.

also try doing this to avoid these kinda errors
$LastName = (isset($_GET["LastName"]))?mysql_escape_string($_GET["LastName"]):'';

it'll check if the variable is set, if not then it'll make it equal to space

EDIT: just noticed you din't use mysql_select_db('database_name') to select the dataabse you want to work on

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