Getting plugin options in PHP file

Hi there,

I am developing a plugin for wordpress and run in a little problem. The user can modify the options of the plugin in the wordpress backend.

For my plugin I need a php-file wich is reloaded every now and than via Ajax. The php-file wich is reloaded via Ajax has only a few lines of code but I should get the values of the options the users sets in the backend. Is there a simple way to do this?

Thx for any hint

Markus