[php] geen valid mySQL result resource

[gizmo9003]

Ik krijg telkens:
Warning: Supplied argument is not a valid MySQL result resource on line 101

nu is lijntje 101: echo "<center> blaaat...
(zie hieronder)

wat is er dan fout aan?

PHP:

<? $query = "SELECT * FROM programs WHERE Sub_Category = '$Id'"; $result = mysql_query($query,$db); while ($table_programs = mysql_fetch_row($result))   {   echo "<center><table class='MsoNormalTable' border='1' cellpadding='0' width='90%'; style='width: 90.0% border-collapse:collapse' bordercolorlight='#FFFF99' bordercolordark='#1D75BC' bgcolor='#A7C8EF' bordercolor='#111111' cellspacing='0'>        <tr style='height:14.25pt'>          <td width='33%' style='width:33.0%;padding:.75pt .75pt .75pt .75pt; height:14.25pt' bordercolorlight='#1D75BC' bordercolordark='#FFFF99' bgcolor='#A7C8EF'>            <p class='MsoNormal'>?>

[D2k]

[url="http://gathering.tweakers.net/forum/list_messages/392390/#phpdebug"]http://gathering.tweakers.net/forum/list_messages/392390/#phpdebug[/url]