You're not BooK to speak more than a language at the same time :)). You have to quote you Javascript to produce a correct header:

print start_html (
  -title=>'quiz',
  -script=>{
    -language=>'JAVASCRIPT',
    -code => qq|
      <!--
      function winopen()
      {
        newwin=window.open("","","scrollbars")
        if (document.all){
          newwin.moveTo(0,0)
          newwin.resizeTo(screen.width,screen.height)
        }
      }
      //-->
    |
  }
  -BGCOLOR=>'beige'
  -onLoad=>'winopen()'
);
[download]