&#106avascript计算器

&#106avascript计算器(2)    <TD></TD>
   <TD align=middle><input name="btnPlus" type="Button" value="  +  " onclick="Operation('+')"> </TD>
   <TD align=middle><input name="btnMinus" type="Button" value="  -  " onclick="Operation('-')"></TD>
  </TR>
  <TR>
   <TD><input name="btnOne" type="Button" value="  1  " onclick="NumPressed(1)"></TD>
   <TD><input name="btnTwo" type="Button" value="  2  " onclick="NumPressed(2)"></TD>
   <TD><input name="btnThree" type="Button" value="  3  " onclick="NumPressed(3)"></TD>
   <TD></TD>
   <TD align=middle><input name="btnMultiply" type="Button" value="  *  " onclick="Operation('*')"></TD>
   <TD align=middle><input name="btnDivide" type="Button" value="  /  " onclick="Operation('/')"></TD>
  </TR>
  <TR>
   <TD><input name="btnZero" type="Button" value="  0  " onclick="NumPressed(0)"></TD>
   <TD><input name="btnDecimal" type="Button" value="  .  " onclick="Decimal()"></TD>
   <TD colspan=2></TD>
   <TD><input name="btnEquals" type="Button" value="  =  " onclick="Operation('=')"></TD>
   <TD><input name="btnReturn" type="Button" value="返 回" onclick="goReturn()"></TD>
  </TR>
 </TABLE>
</TABLE>
</B>
</FORM>
</CENTER>
<font face="Verdana, Arial, Helvetica" size=2>
<SCRIPT LANGUAGE="JavaScript">