a.htm
<html>
<head><title>father</title></head>
<body>
<script >
function Add_Text1Value(content)
{
document.getElementById("text1").value = content;
var Values= document.getElementById("text1").value;
}
</script>
<FORM action="" method=POST id=form1 name=form1>
<INPUT type="text" id=text1 name=text1>
<INPUT type="button" value="open child window" name=button1 οnclick="window.open('b.htm')">
</FORM>
</body>
</html>
b.htm
<HTML>
<HEAD>
<SCRIPT>
function button1_onclick()
{
var data = window.opener.Add_Text1Value("good moning!");
window.close();
}
</SCRIPT>
</HEAD>
<BODY>
<INPUT type=button value="click" οnclick="return button1_onclick()" />
</BODY>
</HTML>