Fredo: bewegen

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Quelltext:
<html>
<head><title>Test</title>
<style type="text/css">
img { position:absolute; }

</style>
<script type="text/javascript">
var a = 0;
var b = 0;
var i = 1;
function down() {
a++;
b++;

document.getElementsByTagName("img").style.left = a + "px";
document.getElementsByTagName("img").style.top = b + "px";

i++;

if (i >= 200) {
window.clearInterval(moving);
}

moving = window.setInterval("down()", 10);

}

</script>

</head>
<body bgcolor="blue" onload="runter()">

<img src="sonne.bmp">

</body></html>

Fehlermeldung:

Fehler: document.getElementsByTagName("img").style has no        properties
Zeile: 14

so natürlich