Code:
<html>
<head>
<title>My home page</title>
<script type="text/javascript">
function printtotextbox(what) {
box = document.yourform.textbox;
box.value=box.value + " " + what;
}
</script>
</head>
<body>
<form name="yourform">
<input type="checkbox" name="Alpha" value="abc" onclick="printtotextbox('abc')">abc<br>
<input type="checkbox" name="Alpha" value="def" onclick="printtotextbox('def')">def<br>
<input type="checkbox" name="Alpha" value="ghi" onclick="printtotextbox('ghi')">ghi<br>
<input type="text" name="textbox" value="Selected products:">
</body>
</html>
That should work.
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