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@@ -137,6 +137,7 @@ class CmsApplication extends CmsObject
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     $this->variables['pluginnum'] = 1;
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     #Setup hash for storing all modules and plugins
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+		$this->coremodules         = array('UserAdmin','MenuManager');
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     $this->cmsmodules          = array();
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     $this->userplugins         = array();
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     $this->userpluginfunctions = array();

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@@ -677,7 +677,12 @@ abstract class CmsModuleBase extends CmsObject
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   {
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     return FALSE;
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   }
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-	
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+
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+	final public function is_core()
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+	{
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+		return CmsModuleOperations::is_core($this->get_name());
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+	}
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+
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   final public function is_installable()
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   {
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     $gCms = cmsms();
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@@ -782,7 +787,7 @@ abstract class CmsModuleBase extends CmsObject
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   final public function is_uninstallable()
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   {
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-		return !$this->check_for_dependents();
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+		return !$this->check_for_dependents() && !$this->is_core();
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   }
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   public function drop_table($table)

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@@ -38,6 +38,10 @@ class CmsModuleOperations extends CmsObject
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   var $error;
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   /**
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+	 * A member to hold a list of core module names
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+	 */
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+
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+	/**
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   * A member to hold the id of the active tab
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   */
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   var $mActiveTab = '';
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@@ -94,6 +98,16 @@ class CmsModuleOperations extends CmsObject
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   }
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   /**
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+	 * Returns wether or not a module is a 'core' module or not
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+	 *
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+	 * @param string Name of the module
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+	 */
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+	public static function is_core($module_name)
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+	{
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+		return in_array($module_name,cmsms()->coremodules);
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+	}
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+
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+	/**
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    * Returns the module object if it is installed and active.
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    *
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    * @param string Name of the module