My plugin doesn't work

[challii]

I'm just starting out at plugins, so forgive the stupidity of this question.

PHP Code:

global $id2;
$id2 = 4; 

Thats my plugin code, hooked to global_start. I try putting $id2 into a template and it echoes nothing. The plugin is active. And plugins are enabled.

[bashy]

Perhaps posting in the correct section would get a better response..
although.....all will see it on the home page.... pmsl

Ask a mod to move it m8

[challii]

Well weirdly it does work on some templates, but not on others!