function changeVisibility(change,div_name)
{
    $('forms').style.visibility="hidden";
    $('friend_forms').style.visibility="hidden";
    $('message').style.visibility="hidden";
        if(change){
            $('bg_forms').style.visibility="visible";
            $(div_name).style.visibility="visible";
            if($('bg_project_specs')){
                $('bg_project_specs').style.visibility="hidden";
                $('project_specs').style.visibility="hidden";
            }
        }
        else{
            $('bg_forms').style.visibility="hidden";
            if($('bg_project_specs')){
                $('bg_project_specs').style.visibility="visible";
                $('project_specs').style.visibility="visible";
            }
        }
}