INDEX.HTML
<html>
<head>
<title>Index</title>
<script language=javascript>
function busca(mypage, myname, w,h, scroll){
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = 'height=' + h + ', width=' + w + ', top=' + wint + ', left=' + winl + ', scrollbars=' + scroll + ', resizable';
	win = window.open(mypage, myname, winprops)
	if (parseInt(navigator.appVersion) >= 4) {
		win.window.focus();
		return false;
	}
	return false;	
}
</script>
<script language=javascript>
function fazer_algo( sText ) {
	 valor = sText;
}
</script>
</head>
<body>
index
<input type=text name='teste' onChange="fazer_algo(document.write(this.valor))">
<a href="#" onclick="busca('popup.html', 'busca', width=400, height=300);">busca</a>
</body>
</html>POPUP.HTML
<html>
<head>
<title>Popup</title>
<script language='JavaScript'>
function enviar_comando() {
  var sText = window.document.forms['form'].elements['text'].value;
  opener.fazer_algo( sText );
}
</script>
</head>
<form name='form' action='_blank' method='post'>
<input type='text' name='text' value='valor_para_o_index'><br>
<input type='button' name='button' value='Clique' onclick='enviar_comando(); '>
</form>
<body>
</body>
</html>Grato



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