点击一个按钮(同上)让文本框值等于上一个文本框的值?请大家帮帮忙
(1) <tr>
<td align="right"><font color="#FF0000">*</font>手机:</td>
<td><input type="text" name="submitterMobile"></td>
</tr>
<tr>
<td align="right">业务公开手机:</td>
<td><input type="text" name="submitterMobileOpen">
<input type="button" name="mobilebutton" value="同上"></td>
</tr>
(2)如何把两个下拉列的值在点击按钮后也付给文本框
<tr>
<td align="right"><font color="#FF0000">*</font> 街道门牌:</td>
<td><input type="text" name="streetNumber"></td>
</tr>
<tr>
<td align="right"><font color="#FF0000">*</font>楼房单元房号:</td>
<td><input type="text" name="buildingUnitRmNumber"></td>
</tr>
<tr>
<td align="right">通讯地址:</td>
<td><input type="text" name="addressMailing">
<input type="button" name="addressMailingbutton" value="同上">
</td>
</tr>
请问用javascript怎么解决?先谢谢了