improve the display of agora related command result

@@ -1843,7 +1843,7 @@
 						<tr>
 								<td colspan="2"><button type="button" id="enter_channel" onclick="javascript:onTestClick(this);">Enter Channel</button></td>
 								<td colspan="2"><button type="button" id="leave_channel" onclick="javascript:onTestClick(this);">Leave Channel</button></td>
-								<td><div id="res_enter_channel"></div></td>
+								<td colspan="2" id="res_enter_channel"></td>
 						</tr>
 						<tr>
 								<td><img src="images/spacer.gif" width="55" height="30" /></td>
@@ -1863,7 +1863,7 @@
 						<tr>
 								<td colspan="2"><button type="button" id="start_screen_share" onclick="javascript:onTestClick(this);">Start Screen share</button></td>
 								<td colspan="2"><button type="button" id="stop_screen_share" onclick="javascript:onTestClick(this);">Stop Screen Share</button></td>
-								<td><div id="res_screen_share"></div></td>
+								<td colspan="2" id="res_screen_share"></td>
 						</tr>
 					</tr>
 						<td colspan="2"><button type="button" id="get_aac_mics" onclick="javascript:onTestClick(this);">Get Agora Mics</button></td>
@@ -1874,7 +1874,7 @@
 					<tr>
 						<td colspan="2"><button type="button" id="start_audio_share" onclick="javascript:onTestClick(this);">Start Audio share</button></td>
 						<td colspan="2"><button type="button" id="stop_audio_share" onclick="javascript:onTestClick(this);">Stop Audio Share</button></td>
-						<td><div id="res_audio_share"></div></td>
+						<td colspan="2" id="res_audio_share"></td>
 				</tr>
 
 			</table>