Forum Moderators: open
This should do the trick:
<html>
<head>
<script type="text/javascript">
function check() {
document.getElementById("checkbox").checked = "checked";
}
</script>
</head>
<body>
<img src="YOUR_IMAGE" onclick="javascript:check();">
<input type="checkbox" id="checkbox" />
</body>
</html>
HTH, J.