Unable to delete multiple rows via checkbox

[micmac]

Hi all,
I can't figure out why the following won't delete multiple rows from the mysql DB.

if ($_POST['delete_selected_article']){
foreach($_POST["delete_article_id"] as $k=>$v) { 
echo "DEL $k = $v<br>"; 
$delete = mysql_query("DELETE FROM knowledgebase_articles WHERE knowledgebase_article_id = $v");
}

You will notice i have echoed the results. The result i get for this is correct except it wont delete the rows from the DB, not even one.
Any ideas to why this might be?
Cheers,
micmac

[mrhappiness]

if ($_POST['delete_selected_article']){
$sql='DELETE FROM knowledgebase_articles
WHERE knowledgebase_article_id IN ('.implode(', ',$_POST['delete_article_id']).')';
echo $sql;
mysql_query($sql) or die(mysql_error());
}

what about this?