<script>
function deleteVal() {
var chk = document.getElementById('delete');
// If the checkbox has been set to delete
if (chk.checked == true) {
var ok=confirm("You are about to delete the selected images below.\nAre you sure you want to do this?");
if (ok) {
// Submit
return true;
} else {
// Don't submit
return false;
}
}
// Delete box was not ticked so return true and submit form
return true;
}
</script>
<form action="" method="POST" onSubmit="return deleteVal();">
<label>Delete images?</label><input type="checkbox" name="delete" id="delete"/>
<input type="submit" name="submit" value="Submit" />
</form>