<h2>input1</h2>
<input type="text" /><input type="submit" />
<h2>input2</h2>
<input type="text" /><input type="submit" />

<script type="text/javascript"><!--
var aInput = document.getElementsByTagName("input");
for (i = 0 ; i < aInput.length ; i++ )
{
(
function (i){
if (aInput[i].getAttribute("type") == "submit")
{
aInput[i].onclick = function (){
window.open('b.html?'+i,'newwindow','height=100,width=400')
}
}
}
)(i)
}
// --></script>

<h2>openWindow</h2>
<input type="text" /><input type="submit" />

<script type="text/javascript"><!--
var aInput = document.getElementsByTagName("input");

for (i = 0 ; i < aInput.length ; i++ )
{
if (aInput[i].getAttribute("type") == "text") var textboxB = new Object(aInput[i]);
if (aInput[i].getAttribute("type") == "submit") var btnB = new Object(aInput[i]);
}

btnB.onclick = function(){
var sTextValue = textboxB.value
var aInput = window.opener.document.getElementsByTagName("input");
var sUrl = document.location;
var sNo = sUrl.toString().slice(-1)
window.opener.aInput[sNo-"1"].value = sTextValue
window.close();
}
// --></script>