Trouble - can`t get variable in template from plugin

[Ljusya]

Please, help with my code:

I have 2 plugin

First - in blog_entry_start

PHP Code:

$myvar='12345';
$search='$bloginfo[comments_visible]</span>';
$vbulletin->templatecache['blog_show_entry']=str_replace($search,$search.fetch_template('mytemplate'), $vbulletin->templatecache['blog_show_entry']); 

Second in blog_list_entries_start

PHP Code:

$myvar='12345';
$search='<!-- trackbacks -->';
$vbulletin->templatecache['blog_entry']=str_replace($search,$search.fetch_template('mytemplate'), $vbulletin->templatecache['blog_entry']); 

And template 'mytemplate' with code

$myvar
Some text

Both plugin work - phrase "some text" appear in the right places But text from variable $myvar appear only in places of blog_entry_start

How can i get my variable for use in mytemplate from second plugin in hook blog_list_entries_start ? Why similar code gives different results?

--------------- Added [DATE]1254401073[/DATE] at [TIME]1254401073[/TIME] ---------------

Nobody can`t help me?