Hola, no vi el efecto que decias, pero aca te va uno.
Pon el codigo enter <body> y </body>, en la pagina principal..
Codigo:
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<script>
<!--
var winheight=100
var winsize=100
var x=5
function openwindow(thelocation){
temploc=thelocation
if (!(window.resizeTo&&document.all)&&!(window.resizeTo&&document.getElementById)){
window.open(thelocation)
return
}
win2=window.open("","","")
win2.moveTo(0,0)
win2.resizeTo(100,100)
go2()
}
function go2(){
if (winheight>=screen.availHeight-3)
x=0
win2.resizeBy(5,x)
winheight+=5
winsize+=5
if (winsize>=screen.width-5){
win2.location=temploc
winheight=100
winsize=100
x=5
return
}
setTimeout("go2()",50)
}
//-->
</script>
<p><a href="javascript:openwindow('http://www.altavista.com')">Oprima para abrir altavista</a>
<p><a href="javascript:openwindow('http://www.yahoo.es')">Oprima para abrir yahoo</a>
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espero que te sea de ayuda
