&gtHEAD&lt

&gtSCRIPT LANGUAGE="JavaScript"&lt

&gt!-- This script and many more are available free online at --&lt
&gt!-- The JavaScript Source!! http://javascript.internet.com --&lt

&gt!-- Begin

//  DECLARE AND INITIALIZE VARIABLES
  var zero 	= '0';
  var one 	= '1';
  var two 	= '2';
  var three = '3';
  var four 	= '4';
  var five 	= '5';
  var six = '6';
  var seven = '7';
  var eight = '8';
  var nine 	= '9';
  var add 	= '+';
  var subtract = '-';
  var multiply = '*';
  var divide = '/';
  var decimal = '.';
  var power = '^';

//  FUNCTION: compute
function compute(f)
{
  f.view.value = eval(f.view.value);
}

//  FUNCTION: getNum
function getNum(f, val)
{
  f.view.value += val;
}

//  End -->
&gt/script&lt

&gt/HEAD&lt

&gtBODY&lt

&gtCENTER&lt
&gtTABLE CELLPADDING=0 CELLSPACING=0 BORDER=1 BORDERCOLOR=DDDDDD>
&gtTR&lt&gtTD&lt
&gtTABLE CELLPADDING=7 CELLSPACING=0 BGCOLOR=AABBCC&lt
&gtFORM NAME="calc"&lt
  &gtTR&lt
    &gtTD COLSPAN=2&lt
      &gtDIV ALIGN=LEFT&lt<SMALL&lt<FONT COLOR=000000&lt
      BG-78 Calculator
      &gt/FONT&lt&gt/SMALL&lt</DIV&lt
        &gtINPUT TYPE=text NAME="view" SIZE=30 action="compute(this)"&lt&gtBR&lt
      &gtHR&lt
    &gt/TD&lt
  &gt/TR&lt

  &gtTR&lt
    &gtTD COLSPAN=2&lt<DIV ALIGN=RIGHT&lt
        &gtINPUT TYPE=button VALUE="  7  " onClick="getNum(this.form, seven)"&lt 
        &gtINPUT TYPE=button VALUE="  8  " onClick="getNum(this.form, eight)"&lt 
        &gtINPUT TYPE=button VALUE="  9  " onClick="getNum(this.form, nine)"&lt 
        &gtINPUT TYPE=button VALUE="   .  " onClick="getNum(this.form, decimal)"&lt 
        &gtINPUT TYPE=reset VALUE="   C  "&lt 
      &gt/DIV&lt&gt/TD&lt
  &gt/TR&lt		
  &gtTR&lt
      &gtTD COLSPAN=2&lt<DIV ALIGN=RIGHT&lt
        &gtINPUT TYPE=button VALUE="  4  " onClick="getNum(this.form, four)"&lt 
        &gtINPUT TYPE=button VALUE="  5  " onClick="getNum(this.form, five)"&lt 
        &gtINPUT TYPE=button VALUE="  6  " onClick="getNum(this.form, six)"&lt 
        &gtINPUT TYPE=button VALUE="  *  " onClick="getNum(this.form, multiply)"&lt 
        &gtINPUT TYPE=button VALUE="   /    " onClick="getNum(this.form, divide)"&lt
      &gt/DIV&lt&gt/TD&lt
  &gt/TR&lt		
  &gtTR&lt
      &gtTD COLSPAN=2&lt&gtDIV ALIGN=RIGHT&lt
        &gtINPUT TYPE=button VALUE="  1  " onClick="getNum(this.form, one)"&lt 
        &gtINPUT TYPE=button VALUE="  2  " onClick="getNum(this.form, two)"&lt 
        &gtINPUT TYPE=button VALUE="  3  " onClick="getNum(this.form, three)"&lt 
        &gtINPUT TYPE=button VALUE="  -  " onClick="getNum(this.form, subtract)"&lt 
        &gtINPUT TYPE=button VALUE="   +   " onClick="getNum(this.form, add)"&lt 
      &gt/DIV&lt&gt/TD&lt
  &gt/TR&lt	
  &gtTR&lt
      &gtTD&lt&gtDIV ALIGN=CENTER&lt
      &gtINPUT TYPE=button VALUE="  0  " onClick="getNum(this.form, zero)"&lt
      &gt/DIV&lt
      &gt/TD&lt
      &gtTD&lt
      &gtDIV ALIGN=RIGHT&lt
        &gtINPUT TYPE=button VALUE="   =   " onClick="compute(this.form)"&lt
      &gt/DIV&lt
      &gt/TD&lt
  &gt/TR&lt
  &gt/FORM&lt