Adding variable into the headinclude template?

[mrbiesheuvel]

I wrote a plugin to put some variables into the headinclude template:

PHP Code:

$include = '<!-- Dit is een test -->';

vB_Template::preRegister('headinclude',array('included_header' => $include)); 


The hook is init_startup

I have also tried parse_templates as hook but it keeps givin an empty space it as if the variable was never set to the template?

Can somebody tell me what I'm doing wrong?