<select oninput="change_image(this)" id="sky-list">
<option value="../resource/sky-demo.png">sky-demo</option>
<option value="../resource/sky-test-1.jpg">sky-test-1</option>
<option value="../resource/sky-test-2.jpg">sky-test-2</option>
<option value="../resource/sky-test-3.jpg">sky-test-3</option>
<option value="../resource/sky-test-5.jpg">sky-test-4</option>
</select>