how to get or set the helper_get_current_project() value ??

[PHPycho]

Hello forums!!
I would like to know how to make the particular project selected in the project dropdown list (in top right corner).
suppose i want to work in view_all_bug_page.php, how to make the project say x to be selected for this page. Generally i had seen that project values are get using helper_get_current_project() function.
I think that project dropdown is situated in html_page_top2() function, if you pass some project id to some variable, then the respective project may be selecte..I dont know much..
Please help me on the case..
Thanks in advance to all of you !!