aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaa<br>
<input type=button value="...." onclick='n1();'>

<script type="text/javascript">
function n1(){
//alert(1);
	parent.document.getElementById("dv1").style.display = "block";
//	parent.document.getElementById("dv2").style.display = "none";
}
</script>