how to disable this link

[beboo002]

<?
if($a==0||$a==1)
{
echo "<a href='home1.php'>home[/url]";
}
?>
how to disable this link and when user click the above link it gives alert msg also.

[hoangkc]

<?
if($a==0||$a==1)
{
echo "<a href='home1.php' onclick=\"alert('this link is disabled'); return false;\">home[/url]";
}
?>

[beboo002]

thanks for reply

here i am not reciving any alert msg

[Declan1991]

<?
if($a==0||$a==1)
{
echo "<a href='home1.php' onclick=\"alert('this link is disabled'); return false;\">home</a>";
}
?>