手动调节背景色：背景色能用按钮进行手动调节

以下为详细代码

手动调节背景色：背景色能用按钮进行手动调节
<script language="JavaScript">

</script>
<form name="color">
<table>
<tr align="Center"> 
<td> 
<input name="red" type="button" value=" +50 " onClick="upred(50)">
</td>
<td> 
<input name="red2" type="button" value=" + 10 " onClick="upred(10)">
</td>
<td> 
<input name="red2" type="button" value=" + 1" onClick="upred(1)">
</td>
<td width="50"><font color="#FF0000" size=+3><b><font color="#FA0000">红</font></b></font></td>
<td> 
<input name="red-" type="button" value=" - 1" onClick="downred(1)">
</td>
<td> 
<input name="red-" type="button" value=" - 10 " onClick="downred(10)">
</td>
<td> 
<input name="red-" type="button" value=" -50 " onClick="downred(50)">
</td>
<td> 
<input type="text" name="rd" size=3>
</td>
</tr>
<tr align="Center"> 
<td> 
<input name="green" type="button" value=" +50 " onClick="upgreen(50)">
</td>
<td> 
<input name="green" type="button" value=" + 10 " onClick="upgreen(10)">
</td>
<td> 
<input name="green" type="button" value=" + 1" onClick="upgreen(1)">
</td>
<td width="50"><font color="#00FF00" size=+3><b><font color="#00FA00">绿</font></b></font></td>
<td> 
<input name="green-" type="button" value=" - 1" onClick="downgreen(1)">
</td>
<td> 
<input name="green-" type="button" value=" - 10 " onClick="downgreen(10)">
</td>
<td> 
<input name="green-" type="button" value=" -50 " onClick="downgreen(50)">
</td>
<td> 
<input type="text" name="gr" size=3>
</td>
</tr>
<tr align="Center"> 
<td> 
<input name="blue" type="button" value=" +50 " onClick="upblue(50)">
</td>
<td> 
<input name="blue" type="button" value=" + 10 " onClick="upblue(10)">
</td>
<td> 
<input name="blue" type="button" value=" + 1" onClick="upblue(1)">
</td>
<td width="50"><font color="#0000FF" size=+3><b><font color="#0000FA">蓝</font></b></font></td>
<td> 
<input name="blue-" type="button" value=" - 1" onClick="downblue(1)">
</td>
<td> 
<input name="blue-" type="button" value=" - 10 " onClick="downblue(10)">
</td>
<td> 
<input name="blue-" type="button" value=" -50 " onClick="downblue(50)">
</td>
<td> 
<input type="text" name="bl" size=3>
</td>
</tr>
<tr align="Center"> 
<td> </td>
<td> </td>
<td> </td>
<td width="50"> 
<input type="text" name="rgbdspl" size=7>
</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
</form>