IF ROW EXISTS?

$xt_db_create = "CREATE TABLE IF NOT EXISTS `page_xt`.`xt_$meno` (
`xt_id` BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`xt_usr` VARCHAR( 12 ) NOT NULL ,
`xt_date` DATETIME NOT NULL ,
`xt_txt` TEXT NOT NULL
) ENGINE = MYISAM CHARACTER SET utf8 COLLATE utf8_slovak_ci";


mysql_query("$xt_db_create");

INSERT INTO `page_xt`.`xt_$meno` (
`xt_id` ,
`xt_usr` ,
`xt_date` ,
`xt_txt`
)
VALUES (
NULL , '$meno', '$time', 'Vitaj'
);

$xt_db_create = "CREATE TABLE IF NOT EXISTS `xt`.`xt_$meno` (
`xt_id` BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`xt_usr` VARCHAR( 12 ) NOT NULL ,
`xt_date` DATETIME NOT NULL ,
`xt_txt` TEXT NOT NULL
) ENGINE = MYISAM CHARACTER SET utf8 COLLATE utf8_slovak_ci";

$xt_db_first_row = "INSERT INTO `xt`.`xt_$meno` (
`xt_id` ,
`xt_usr` ,
`xt_date` ,
`xt_txt`
)
VALUES (
NULL , '$meno', NOW(), 'Vitaj'
); ";





if (@mysql_query("$xt_db_create"))
mysql_query("$xt_db_first_row");

rn 1;

$tbulka ="SELECT * FROM `xt_$meno`";
 $vysledok = MySQL_Query($tbulka);
 if (!$vysledok)
    echo "chat je mentálne nedostupný zavolajte najskôr prosím!";

while ($vypis = MySQL_Fetch_Array($vysledok)) {
echo "<table id=\"XAT_tbl\">
  <tr>
    <td class=\"XAT_tbl_td1\">$vypis['xt_date']</td>
    <td class=\"XAT_tbl_td2\">$vypis['xt_usr']</td>
    <td class=\"XAT_tbl_td3\">$vypis['xt_txt']</td>
  </tr>
";

}

echo '</table>';

$string = "<td class=\"XAT_tbl_td3\">{$vypis['xt_txt']}</td> ";

$string = "<td class=\"XAT_tbl_td3\">".$vypis['xt_txt']."</td> ";

$string = sprintf("<td class=\"XAT_tbl_td3\">%s</td> ",$vypis['xt_txt']);

$string = '<td class="XAT_tbl_td3"></td>';

$x = 'zxcvzxcv'.$xxx.'xcvzxcvzxv';

$x = sprintf('zxcvzxcv%sxcvzxcvzxv',$xxx);