Hier ist der Script viel spaß damit!! <script language="JavaScript"> <!-- function Ergebnis() { var x = 0; x = eval(window.document.Rechner.Display.value); window.document.Rechner.Display.value = x; } function Hinzufuegen(Zeichen) { window.document.Rechner.Display.value = window.document.Rechner.Display.value + Zeichen; } function Sonderfunktion(Funktion) { if(Funktion == "sqrt") { var x = 0; x = eval(window.document.Rechner.Display.value); window.document.Rechner.Display.value = Math.sqrt(x); } if(Funktion == "pow") { var x = 0; x = eval(window.document.Rechner.Display.value); window.document.Rechner.Display.value = x * x; } if(Funktion == "log") { var x = 0; x = eval(window.document.Rechner.Display.value); window.document.Rechner.Display.value = Math.log(x); } } file://--> </script> <center> <h1>Rechner</h1> <form name="Rechner"> <div align="center"><table border="10" cellpadding="10" bgcolor="#C0C0C0"> <tr> <td bgcolor="#8C8C8C"><input type="text" size="30" maxlength="30" name="Display"></td> </tr> <tr> <td><table border="0"> <tr> <td width="50"><input type="button" value=" 7 " onclick="Hinzufuegen('7')"></td> <td width="50"><input type="button" value=" 8 " onclick="Hinzufuegen('8')"></td> <td width="70"><input type="button" value=" 9 " onclick="Hinzufuegen('9')"></td> <td width="50"><input type="button" value=" + " onclick="Hinzufuegen('+')"></td> </tr> <tr> <td width="50"><input type="button" value=" 4 " onclick="Hinzufuegen('4')"></td> <td width="50"><input type="button" value=" 5 " onclick="Hinzufuegen('5')"></td> <td width="70"><input type="button" value=" 6 " onclick="Hinzufuegen('6')"></td> <td width="50"><input type="button" value=" - " onclick="Hinzufuegen('-')"></td> </tr> <tr> <td width="50"><input type="button" value=" 1 " onclick="Hinzufuegen('1')"></td> <td width="50"><input type="button" value=" 2 " onclick="Hinzufuegen('2')"></td> <td width="70"><input type="button" value=" 3 " onclick="Hinzufuegen('3')"></td> <td width="50"><input type="button" value=" * " onclick="Hinzufuegen('*')"></td> </tr> <tr> <td width="50"><input type="button" value=" = " onclick="Ergebnis()"></td> <td width="50"><input type="button" value=" 0 " onclick="Hinzufuegen('0')"></td> <td width="70"><input type="button" value=" . " onclick="Hinzufuegen('.')"></td> <td width="50"><input type="button" value=" / " onclick="Hinzufuegen('/')"></td> </tr> <tr> <td width="50"><input type="button" value=" sqr " onclick="Sonderfunktion('sqrt')"></td> <td width="50"><input type="button" value=" ² " onclick="Sonderfunktion('pow')"></td> <td width="70"><input type="button" value=" log " onclick="Sonderfunktion('log')"></td> <td width="50"><input type="reset" value=" C "></td> </tr> </table> </td> </tr> </table> </center></div> </form>