Menu -labels external text file

I want to create a menu which involves 5 links, and all the text labels will be from external text file. once a user click on one of the link, (some file loads to the target movie clip.) and the link gets disabled, so tht it should not allow to click again and load a file again…& its vice-versa when a user cliks on other links as well… how to do it…

please let me know