JavaScript for target=_top

I'm using the current script below but instead of having var newwindow=1 i need the target window to be _top as this scipt is currently sitting in an iframe.

any advice please?
thanks!


<script language="JavaScript1.2">
<!--
//specify interval between slide (in mili seconds)
var slidespeed=2000

//specify images
var slideimages=new Array("promosmall1.gif","promosmall2.gif","promosmall3.gif","promosmall4.gif")

//specify corresponding links
var slidelinks=new Array("specials4.asp?id=41&page=4","specials2.asp?id=14&page=2","specials5.asp?id=53&page=5","specials.asp?id=1&page=1")

var newwindow=1 //open links in new window? 1=yes, 0=no

var imageholder=new Array()
var ie=document.all
for (i=0;i<slideimages.length;i++){
imageholder[i]=new Image()
imageholder[i].src=slideimages[i]
}

function gotoshow2(){
if (newwindow)
window.open(slidelinks[whichlink])
else
window.location=slidelinks[whichlink]
}

//-->
</script>
      <a href="javascript:gotoshow2()"><img src="../images/promos/promosmall1.gif" name="slide" border=0 align="top" style="filter:blendTrans(duration=3)"/></a>
              <script language="JavaScript1.2">
                        <!--
                        var whichlink=0
                        var whichimage=0
                        var blenddelay=(ie)? document.images.slide.filters[0].duration*1000 : 0
                        function slideit(){
                        if (!document.images) return
                        if (ie) document.images.slide.filters[0].apply()
                        document.images.slide.src=imageholder[whichimage].src
                        if (ie) document.images.slide.filters[0].play()
                        whichlink=whichimage
                        whichimage=(whichimage<slideimages.length-1)? whichimage+1 : 0
                        setTimeout("slideit()",slidespeed+blenddelay)
                        }
                        slideit()
                        //-->
                  </script>