prova così

nella tua pagina
codice:
<script language="javascript" type="text/javascript" src="chromeless_35.js"></script>
<script language="javascript">

/*
Chromeless Window (v3.5)- By Gabriel Suchowolski (this credit MUST stay intact)
Author site at http://www.microbians.com
Visit http://www.dynamicdrive.com for this script
*/

//For paramater explanations, see accompanying faq.htm file
function openIT(u,W,H,X,Y,n,b,x,m,r) {
	var cU  ='close.gif'   //gif for close on normal state.
	var cO  ='close.gif'  //gif for close on mouseover.
	var cL  ='clock.gif'      //gif for loading indicator.
	var mU  ='minimize.gif'     //gif for minimize to taskbar on normal state.
	var mO  ='minimize.gif'    //gif for minimize to taskbar on mouseover.
	var xU  ='max.gif'     //gif for maximize normal state.
	var xO  ='max.gif'    //gif for maximize on mouseover.
	var rU  ='restore.gif'     //gif for minimize on normal state.
	var rO  ='restore.gif'    //gif for minimize on mouseover.
	var tH  ='<font face=verdana size=2>Chromeless Window</font>'   //title for the title bar in html format.
	var tW  ='Chromeless Window'   //title for the task bar of Windows.
	var wB  ='#D5D5FF'   //Border color.
	var wBs ='#D5D5FF'   //Border color on window drag.
	var wBG ='#D5D5FF'   //Background of the title bar.
	var wBGs='#D5D5FF'   //Background of the title bar on window drag.
	var wNS ='toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=0'  //Html parameters for Netscape.
	var fSO ='scrolling=auto noresize'   //Html parameters for main content frame.
	var brd =b||5;   //Extra border size.
	var max =x||false;   //Maxzimize option (true|false).
	var min =m||false;   //Minimize to taskbar option (true|false).
	var res =r||false;   //Resizable window (true|false).
	var tsz =20;   //Height of title bar.
	return chromeless(u,n,W,H,X,Y,cU,cO,cL,mU,mO,xU,xO,rU,rO,tH,tW,wB,wBs,wBG,wBGs,wNS,fSO,brd,max,min,res,tsz)
}

</script>
codice:

<a href="#" onclick="mywin002=openIT(pagina.htm',550,600,null,null,'mywin002',5,false,false,true,'#FF8000','#FFC184');return false">
lancia chromeless</a>
anche se non so come si comporti con SP2 potrebbe intrpretare la cosa come popup e non come chromeless