3 parts to this script
=====================================================
PART 1
====================================================
<SCRIPT>
<!--
var opStack = new Array(4)
opStack[0] = 0
opStack[1] = ''
opStack[2] = ''
opStack[3] = ''
function start()
{
document.PAD.SUM.value= "0"
}
function KeyinNum()
{
if (opStack[0] >= 2) { opStack[0] = 3 } else { opStack[0] = 1 }
opStack[opStack[0]] = '' + document.PAD.SUM.value
}
function display ()
{
var sum = parseFloat(opStack[1])
var huge = Math.pow(10,14)
sum = Math.round (sum * huge) / huge
document.PAD.SUM.value = '' + sum
}
function resetNum ()
{
opStack[0] = 0
opStack[1] = 0
document.PAD.CAL.value = ''
document.PAD.SUM.value = '0'
}
function entry (x)
{
if (opStack[0] == -1) { opStack[0] = 1; opStack[1] = ''}
if (opStack[0] == 0) { opStack[0] = 1; opStack[1] = ''}
if (opStack[0] == 2) { opStack[0] = 3; opStack[3] = ''}
var result = result = opStack[opStack[0]]
if (result == '0') { result = '' }
//---------------------------------------------------------------------
if (x>='1' && x<='9') { result = '' + result + x }
else if (x == 'P') { result = '' + Math.PI }
else if (x == '0') { if (result != '') result = '' + result + '0' }
else if (x == 'B') { if (result != '') result = result.substring(0, result.length - 1) }
else if (x == '.') {
if (result != '')
{ if (result.indexOf(".") == -1) result += "." }
else
{ result = '0.' }
}
//-----------------------------------------------------------------
if (result =='') result = '0'
opStack[opStack[0]] = result
document.PAD.SUM.value = result
}
function neg()
{
if (opStack[0] != 2 && opStack[0] != 0)
{
opStack[0] = Math.abs(opStack[0])
var result = opStack[opStack[0]]
if (result != '0' && result != '')
{
if (result.charAt(0) == '-')
{ result = result.substring(1, result.length) }
else
{ result = '-' + result }
opStack[opStack[0]] = result
document.PAD.SUM.value = result
}
}
}
function calc1 (x)
{
var opFlag = opStack[0]
if (opFlag == -1 || opFlag == 1)
{
count(x)
}
else if (opFlag == 3)
{
opStack[1] = '' + eval(opStack[1] + opStack[2] + opStack[3])
count(x)
}
}
function count (x)
{
if (x == 'Si') { opStack[1] = '' + Math.sin (opStack[1]) }
else if (x == 'aS') { opStack[1] = '' + Math.asin(opStack[1]) }
else if (x == 'Co') { opStack[1] = '' + Math.cos (opStack[1]) }
else if (x == 'aC') { opStack[1] = '' + Math.acos(opStack[1]) }
else if (x == 'Ta') { opStack[1] = '' + Math.tan (opStack[1]) }
else if (x == 'aT') { opStack[1] = '' + Math.atan(opStack[1]) }
else if (x == '¡Ô') { opStack[1] = '' + Math.pow (opStack[1],.5) }
else if (x == '^2') { opStack[1] = '' + Math.pow (opStack[1], 2) }
else if (x == '^3') { opStack[1] = '' + Math.pow (opStack[1], 3) }
else if (x == '^4') { opStack[1] = '' + Math.pow (opStack[1], 4) }
else if (x == 'AB') { opStack[1] = '' + Math.abs (opStack[1]) }
else if (x == '¡×') { }
document.PAD.CAL.value = ''
opStack[0] = -1
display()
document.PAD.SUM.focus()
document.PAD.SUM.select()
}
function calc2 (x)
{
var opFlag = opStack[0]
if (opFlag != 2)
{
if (opFlag == 3)
{
opStack[1]=''+eval(opStack[1]+opStack[2]+opStack[3])
display()
}
opStack[0] = 2
opStack[2] = x
document.PAD.CAL.value = x
document.PAD.SUM.focus()
document.PAD.SUM.select()
}
}
function fra()
{
var i
var j = 1
var k = document.PAD.SUM.value
if (k >= 70)
{opStack[1] = 0; document.PAD.SUM.value = "---Error---"; return}
for (i = 1; i <= k; i++)
{
j = j * i
}
opStack[1] = document.PAD.SUM.value = j
document.PAD.SUM.focus()
document.PAD.SUM.select()
}
function TurnOff()
{
var ask = confirm("This will close the window, continue?")
if (ask == true) {window.close()}
else {return}
}
//-->
</SCRIPT>
==============================================================
PART 2
===========================================================
<BODY ONLOAD="start()">
===============================================================
PART 3 - put this where you want the calculator to show
================================================================
<!-- --><FORM NAME="PAD">
<TABLE BORDER>
<TR><TD COLSPAN=8>
<INPUT NAME="CAL" TYPE="TEXT" SIZE=1 VALUE="">
Result:
<INPUT NAME="SUM" TYPE="TEXT" SIZE=36 VALUE="" onChange="KeyinNum()">
<TR>
<TD><INPUT TYPE="BUTTON" VALUE="C" onClick="resetNum()" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="OFF" onClick="TurnOff()" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="Square" onClick="calc1('^2')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="X !" onClick="fra()" WIDTH=100>
<TR>
<TD><INPUT TYPE="BUTTON" VALUE="1" onClick="entry('1')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="2" onClick="entry('2')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="3" onClick="entry('3')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="+" onClick="calc2('+')" WIDTH=100>
<TR>
<TD><INPUT TYPE="BUTTON" VALUE="4" onClick="entry('4')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="5" onClick="entry('5')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="6" onClick="entry('6')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="-" onClick="calc2('-')" WIDTH=100>
<TR>
<TD><INPUT TYPE="BUTTON" VALUE="7" onClick="entry('7')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="8" onClick="entry('8')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="9" onClick="entry('9')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="X" onClick="calc2('*')" WIDTH=100>
<TR>
<TD><INPUT TYPE="BUTTON" VALUE="0" onClick="entry('0')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="." onClick="entry('.')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="=" onClick="calc1('=')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="÷" onClick="calc2('/')" WIDTH=100>
<TR>
<TD><INPUT TYPE="BUTTON" VALUE="Backspace" onClick="entry('B')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="SQRT" onClick="calc1('¡Ô')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="Pi" onClick="entry('P')" WIDTH=100>
<TD><INPUT TYPE="BUTTON" VALUE="+/-" onClick="neg()" WIDTH=100>
</TABLE>
</FORM><!-- -->
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