content translation

I have a multilingual Drupal 6 site. In this I have enabled three languages i.e English, Spanish and Brazil.
Recently I have installed the "language switcher drop down" module.The module is just working fine except one problem that when I create a content in "Spanish" language then at the time of node view the "language switcher" drop-down showing all three languages instead of showing only Spanish option.It is also affecting the URL alias after selecting the language other than Spanish. Please help me on this if you have any idea.

Any type of help would be appreciable.

I have installed OP with German as the default language and tried to create translations of existing content, but can't find out how to. I'm missing the usual translate link.

I was under the impression that when selecting a language, from the language selection block (in drupal6), the content is also filtered to display only the nodes in the selected language

This behaviour is also confirmed by this handbook page http://drupal.org/handbook/modules/translation