drupal module, check if node type - drupal

Question

As a more specific take on this question:
drupal jQuery 1.4 on specific pages
How do I check, inside a module, whether or not a node is a certain type to be able to do certain things to the node.
Thanks
The context:
I'm trying to adapt this code so that rather than working on 'my_page' it works on a node type.
function MYMODULE_preprocess_page(&$variables, $arg = 'my_page', $delta=0) {
// I needed a one hit wonder. Can be altered to use function arguments
// to increase it's flexibility.
if(arg($delta) == $arg) {
$scripts = drupal_add_js();
$css = drupal_add_css();
// Only do this for pages that have JavaScript on them.
if (!empty($variables['scripts'])) {
$path = drupal_get_path('module', 'admin_menu');
unset($scripts['module'][$path . '/admin_menu.js']);
$variables['scripts'] = drupal_get_js('header', $scripts);
}
// Similar process for CSS but there are 2 Css realted variables.
// $variables['css'] and $variables['styles'] are both used.
if (!empty($variables['css'])) {
$path = drupal_get_path('module', 'admin_menu');
unset($css['all']['module'][$path . '/admin_menu.css']);
unset($css['all']['module'][$path . '/admin_menu.color.css']);
$variables['styles'] = drupal_get_css($css);
}
}
}
Thanks.

Answer 1

Inside of a module, you can do this:
if (arg(0) == 'node' && is_numeric(arg(1)) && arg(2) != 'edit') {
if (!($node)) {
$node = node_load(arg(1));
}
if ($node->type == 'page') {
// some code here
}
}
That will load a node object given the current node page (if not available). Since I don't know the context of code you are working with, this is kind of a rough example, but you can always see properties of a node by doing node_load(node_id). But, depending on the Drupal API function, it may already be loaded for you.
For example, hook_nodeapi.
http://api.drupal.org/api/function/hook_nodeapi
You could do:
function mymodule_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
switch ($op) {
case 'view':
// some code here
}
}

Answer 2

Try this:-
function MyModule_preprocess_node(&$vars) {
if ($vars['type'] == 'this_type') {
// do some stuff
}
}

Answer 3

Try this:-
$node = node_load(arg(1));
$node =$node->type;
if($node == 'node_type'){
//do something
}