help creating admin page for plugin

I am new to php and to writing WP plugins, but I have successfully written a plugin. It is a simple search and replace thing, but a good place to start. I am trying to create an admin page where the user can make selections that will effect what the plugin searches for and replaces with. Right now I am just trying to get a blank admin page added to WP. From reading and looking at other plugins I have come up with this:

function plugin_add() {
if (function_exists(‘add_options_page’)) {
add_options_page(‘plugin’, ‘plugin’, 0, basename(__FILE__), ‘plugin_subpanel’);
}
}

add_action(‘admin_menu’, ‘plugin_add’);

now what happens when I activate it, the page goes blank, if I acces wp-admin, the new menu is there, under options, and it will allow me to see the blank admin page. Well, that is the case in Firefox. In IE I can view the blog, but any attempt to login ar acces wp-admin just leads to blank screen. I have tried on both WP 2.1.3 and 2.0.4
Any help much appreciated