Model problem

[eluser]theprodigy[/eluser]

foreach ($navlist as $key => $list){
foreach ($list as $topkey => $toplist){
echo "\n<li class='cat'>\n";
echo anchor("welcome/cat/",$toplist['name']);

if (isset($toplist['children'])){
echo "\n<ul>";
foreach ($toplist['children'] as $subkey => $subname){
echo "\n<li class='subcat'>\n";
echo anchor("welcome/cat/",$subname);
echo "\n</li>";
}
echo "\n</ul>";
}
echo "\n</li>\n";
}
}

you're doing a foreach directly inside a foreach without making sure that the current element is an array. Only one element in $list is an array (the children element).

Your first loop through the first foreach, $key is set to id, and $list is set to 24. You then try to do a foreach on 24, which is throwing the error.