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\documentclass{scrartcl}
\setcounter{secnumdepth}{0}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{mathptmx}
\usepackage[scaled=.92]{helvet}
\usepackage{courier}
\setlength{\paperwidth}{5.2075in}
\setlength{\paperheight}{3.75in}
\renewcommand*{\familydefault}{phv}
\usepackage[pdftex,margin=0.5in]{geometry}
\usepackage{fancyhdr}
\lhead{Big Money, Inc.}\chead{}
\rhead{Department f\"{u}r Versprechungen}
\lfoot{}\cfoot{}\rfoot{}
\pagestyle{fancy}
\usepackage{graphicx}
\usepackage{color}
\usepackage[pdftex,pdfpagelayout=SinglePage,%
pdftitle={Anlageberechnung},pdfsubject={Formular}%
]{hyperref}
\definecolor{background}{rgb}{0.99,0.98,0.85}
\pagecolor{background}
\setlength{\parindent}{0.0cm}
\usepackage[pdftex]{insdljs}
\begin{insDLJS}[exaacb]{exaacb}{JavaScript functions}
var done = 0;

function docOpen()
{
  if(!done) {
    done = 1;
    var newcolor = [ "RGB", 0.99, 0.98, 0.85];
    var borcolor = [ "RGB", 0.65, 0.79, 0.94]
    this.getField("l01").fillColor = newcolor;
    this.getField("l01").strokeColor = newcolor;
    this.getField("l02").fillColor = newcolor;
    this.getField("l02").strokeColor = newcolor;
    this.getField("l03").fillColor = newcolor;
    this.getField("l03").strokeColor = newcolor;
    this.getField("l04").fillColor = newcolor;
    this.getField("l04").strokeColor = newcolor;
    this.getField("zeit").currentValueIndices = 0;
    this.getField("zeit").fillColor = newcolor;
    this.getField("summe").fillColor = newcolor;
    this.getField("zins").fillColor = newcolor;
    this.getField("ergebnis").fillColor = newcolor;
  }
}

function restrictDecimalDigits(s,n)
{
  var back = s;
  return back;
}

function doCalculation()
{
  var summe = 0.0 + this.getField("summe").value;
  var zins = 0.0 + this.getField("zins").value;
  var zeit = 0 + this.getField("zeit").value;
  var i, faktor, wert;
  faktor = 1.0 + 0.01 * zins;
  for(i = 0; i < zeit; i++) {
    summe = summe * faktor;
  }
  wert = Math.round(100.0 * summe);
  wert = wert.toFixed(0);
  wert = 0.01 * wert;
  wert = wert.toString();
  wert = restrictDecimalDigits(wert, 2);
  this.getField("ergebnis").value = wert;
}
\end{insDLJS}
\OpenAction{/S /JavaScript /JS (docOpen();)}
\newcommand{\textforlabel}[2]{%
\TextField[name={#1},value={#2},width=9em,align=2,%
bordercolor={0.99 0.98 0.85},%
fillcolor={0.99 0.98 0.85},readonly=true]{}%
}
\begin{document}
\begin{Form}
\begin{tabular}{|rl|}
\hline
\multicolumn{2}{|c|}{}\\*[-0.8em]\multicolumn{2}{|c|}{%
\textsc{E\,i\,n\,g\,a\,b\,e\,d\,a\,t\,e\,n}%
}\\
&\\*[-0.8em]\textforlabel{l01}{Investment capital:}&\TextField[%
name=summe,width=10em,bordercolor={0.65 0.79 0.94}]{}%
~\texteuro\\
&\\*[-0.8em]\textforlabel{l02}{Zins:}&\TextField[%
name=zins,width=10em,bordercolor={0.65 0.79 0.94}]{}~\%\\
&\\*[-0.8em]\textforlabel{l03}{Investment time:}&%
\ChoiceMenu[name=zeit,popdown=true,bordercolor={0.65 0.79 0.94}%
]{}{{1}={1},{2}={2},{3}={3},{4}={4},{5}={5},%
{6}={6},{7}={7},{8}={8},{9}={9},{10}={10}}~Jahre\\
&\\*[-0.8em]\hline
\multicolumn{2}{|c|}{}\\*[-0.8em]
\multicolumn{2}{|c|}{\textsc{B\,e\,r\,e\,c\,h\,n\,u\,n\,g}}\\
\multicolumn{2}{|c|}{}\\*[-0.8em]
\multicolumn{2}{|c|}{\PushButton[name=start,%
onclick={doCalculation()},bordercolor={0.65 0.79 0.94},%
fillcolor={0.5 0.5 0.5}]{Start}}\\
\multicolumn{2}{|c|}{}\\*[-0.8em]\hline
\multicolumn{2}{|c|}{}\\*[-0.8em]
\multicolumn{2}{|c|}{\textsc{A\,u\,s\,g\,a\,b\,e}}\\
\multicolumn{2}{|c|}{}\\*[-0.8em]\textforlabel{l04}{%
Result:}&\TextField[name=ergebnis,width=10em,%
bordercolor={0 0 0}]{}~\texteuro\\
\multicolumn{2}{|c|}{}\\
\hline
\end{tabular}
\end{Form}
\end{document}