Your best bet is to do some isset() calls:
eg
if(isset($row['imageurl']))
{
$image=$row['imageurl'];
}
else
{
/*maybe report the problems or handle it like this...*/
$image=$default_image_url;
/*where you have already set up $default_image_url to point somewhere
sensible*/
}
Cheers
--
Phil Driscoll
Dial Solutions
+44 (0)113 294 5112
http://www.dialsolutions.com
http://www.dtonline.org
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