Fullscreen window with taskbar

i’m using this:

function popup(mylink, windowname)
{
if (! window.focus)return true;
var href;
if (typeof(mylink) == ‘string’)
href=mylink;
else
href=mylink.href;
window.open(href, windowname, ‘,type=fullWindow,fullscreen,scrollbars=yes,’);
return false;
}

how do you make it so that you still see the task bar?