dima85,
insertadjacent
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script>
function func() {
document.getElementById('element-select').insertAdjacentHTML('beforeEnd', '<select onchange="news(this.value,\'comd.json\');"><option value=""><\/option><\/select>');
}
</script>
</head>
<body>
<input onclick="func();" value="add" type="button">
<div id="element-select">
<select name="" size="1">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</div>
</body>
</html>