da mir grad so endlos langweilig ist hier mal ein beispiel mit iframes:
--------------Datei 1----------------
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en" style="height:100%;">
<head style="height:100%;">
<title>iFrame Test</title>
</head>
<script type="text/javascript">
function changeBGColor(c)
{
frame2change.changeBGColor(c);
}
</script>
<body>
<iframe src="./iframe.html" width="100" height="100" name="iFrame">
dein browser stinkt!
</iframe>
<iframe src="./frame2.html" width="100" height="200" name="frame2change">
dein browser stinkt immer noch!
</iframe>
</body>
</html>
--------------iframe.html----------------
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en" style="height:100%;">
<head style="height:100%;">
<title>iFrame im Test</title>
</head>
<script type="text/javascript">
function changecolor()
{
parent.changeBGColor(document.getElementById("value").value);
}
</script>
<body>
<input type="text" id="value"><input type="button" onclick="changecolor()">
</body>
</html>
--------------frame2.html----------------
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en" style="height:100%;">
<head style="height:100%;">
<title>iFrame Test</title>
</head>
<script type="text/javascript">
function changeBGColor(c)
{
document.getElementsByTagName("body")[0].style.backgroundColor=c;
}
</script>
<body>
test
</body>
</html>
funktioniert bei mir einwandfrei im firefox 2 und ie 7, wo anders nicht getestet