<FORM name="Keypad" action="">
<TABLE border=0 width=50 height=60 cellpadding=1 cellspacing=5 style="border:5 outset; background-color:#ffeab5">
<TR>
<TD colspan=3 align="middle"><input name="ReadOut" type="Text" size=24 value="0" width=100%></TD>
<TD</TD>
<TD><input name="btnClear" type="Button" value="  C  " onclick="Clear()"></TD>
<TD><input name="btnClearEntry" type="Button" value=" CE " onclick="ClearEntry()"></TD>
</TR>
<TR>
<TD><input name="btnSeven" type="Button" value="  7  " onclick="NumPressed(7)"></TD>
<TD><input name="btnEight" type="Button" value="  8  " onclick="NumPressed(8)"></TD>
<TD><input name="btnNine" type="Button" value="  9  " onclick="NumPressed(9)"></TD>
<TD></TD>
<TD><input name="btnNeg" type="Button" value=" +/- " onclick="Neg()"></TD>
<TD><input name="btnPercent" type="Button" value="  % " onclick="Percent()"></TD>
</TR>
<TR>
<TD><input name="btnFour" type="Button" value="  4  " onclick="NumPressed(4)"></TD>
<TD><input name="btnFive" type="Button" value="  5  " onclick="NumPressed(5)"></TD>
<TD><input name="btnSix" type="Button" value="  6  " onclick="NumPressed(6)"></TD>
<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 colspan=2><input name="btnEquals" type="Button" value="      =      " onclick="Operation('=')"></TD>
</TR>
</TABLE>
</FORM>
<script type="text/javascript"  language="javascript">
<!-- innen
/*
Letöltve a ThomasWebMűhely javascript archívumából:
http://www.thomas98.hu/webmuhely.php
*/

var FKeyPad = document.Keypad;
var Accum = 0;
var FlagNewNum = false;
var PendingOp = "";
function NumPressed (Num) {
if (FlagNewNum) {
FKeyPad.ReadOut.value  = Num;
FlagNewNum = false;
   }
else {
if (FKeyPad.ReadOut.value == "0")
FKeyPad.ReadOut.value = Num;
else
FKeyPad.ReadOut.value += Num;
   }
}
function Operation (Op) {
var Readout = FKeyPad.ReadOut.value;
if (FlagNewNum && PendingOp != "=");
else
{
FlagNewNum = true;
if ( '+' == PendingOp )
Accum += parseFloat(Readout);
else if ( '-' == PendingOp )
Accum -= parseFloat(Readout);
else if ( '/' == PendingOp )
Accum /= parseFloat(Readout);
else if ( '*' == PendingOp )
Accum *= parseFloat(Readout);
else
Accum = parseFloat(Readout);
FKeyPad.ReadOut.value = Accum;
PendingOp = Op;
   }
}
function Decimal () {
var curReadOut = FKeyPad.ReadOut.value;
if (FlagNewNum) {
curReadOut = "0.";
FlagNewNum = false;
   }
else
{
if (curReadOut.indexOf(".") == -1)
curReadOut += ".";
   }
FKeyPad.ReadOut.value = curReadOut;
}
function ClearEntry () {
FKeyPad.ReadOut.value = "0";
FlagNewNum = true;
}
function Clear () {
Accum = 0;
PendingOp = "";
ClearEntry();
}
function Neg () {
FKeyPad.ReadOut.value = parseFloat(FKeyPad.ReadOut.value) * -1;
}
function Percent () {
FKeyPad.ReadOut.value = (parseFloat(FKeyPad.ReadOut.value) / 100) * parseFloat(Accum);
}
// eddig -->
</script>