<!--
/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: James Crooke :: http://www.cj-design.com */

var calculation = "";
var resultDone = false;

function addToCalc(val) {
  if(isNaN(val) && isNaN(calculation.substring(calculation.length-1, calculation.length)))
    return false;

  if(!isNaN(val) && resultDone) {
    resetCalc();
    resultDone = false;
  } else if(isNaN(val) && resultDone) {
    resultDone = false;
  }
  calculation += val;
  showResult();
}

function addToCalcDirect(val) {
  calculation = val;
}

function resetCalc() {
  calculation = "";
  showResult();
}

function positiveNegative() {
  if(calculation.substring(0, 1) == "-")
    calculation = calculation.substring(1, calculation.length);
  else
    calculation = "-" + calculation;
  showResult();
}

function calculate() {
  if(calculation != "") {
    try {
      calculation = eval(calculation);
    } catch(e) {
      reportError("Error!");
    }
    resultDone = true;
    showResult();
  }
  else
    return false;
}

function percentage() {
  try {
    calculation = eval(calculation) / 100;
  } catch(e) {
    reportError("Error!");
  }
  resultDone = true;
  showResult();
}

function squareRoot()
{
  try {
    calculation = Math.sqrt(eval(calculation));
  } catch(e) {
    reportError("Error!");
  }
  resultDone = true;
  showResult();
}

function showResult() {
  calculation = calculation.toString();
  if(calculation == "NaN") {
    reportError("Error!");
  } else {
    document.getElementById("result").value = calculation;
  }
}

function reportError(msg) {
  calculation = msg;
  document.getElementById("result").value = msg;
}

function closeCalculator() {
  document.getElementById("calculator").style.display = "none";
}

function about() {
  msg = "CJ Floating Calculator\n=============\n\n";
  msg += "Developed by James Crooke\nhttp://www.cj-design.com";
  alert(msg);
}

var ie = document.all;
var ns6 = document.getElementById && !document.all;
var dragapproved=false;
var z, x, y;


// -->