Online JavaScript Decimal Calculator

<body topmargin="0" leftmargin="1"> <form name ="frmInfo"> <b> <font face="Arial, Helvetica" size="2">Time:  </font><input type="text" name="Time" size="8"> <script LANGUAGE="JavaScript"> showtime() function showtime() { var now=new Date() var hours=now.getHours() var minutes=now.getMinutes() var seconds=now.getSeconds() var timeValue="" timeValue +=((hours<10) ? " 0" : " ") + hours timeValue +=((minutes<10) ? ":0" : ":") + minutes timeValue +=((seconds<10) ? ":0" : ":") + seconds document.frmInfo.Time.value=timeValue +' ' timer2lD=setTimeout("showtime()",1000) } </script>     </b><font face="Arial, Helvetica" size="2"><b>Date: </b> <u> <font color="#FF8800"> <script LANGUAGE="JavaScript"></script> </u> </font> </font> </form> <center> <table border="0" cellpadding="0" cellspacing="1" width="100%" bgcolor="#666666"> <tr> <td> <FORM NAME="Calc">   <div align="center"> <table border="6" cellpadding="0" cellspacing="0" bgcolor="#FFFFCC"> <tr> <td colspan="3"><INPUT TYPE="text" NAME="Input" Size="16" maxlength="16"> </td> <td><INPUT TYPE="button" NAME="DoIt" VALUE=" = " OnClick="EntryValidation()"> </td> <td><INPUT TYPE="text" NAME="Output" Size="8" maxlength="8"> </td> </tr> <tr> <td align="center"><INPUT TYPE="button" NAME="seven" VALUE=" 7 " OnClick="Calc.Input.value += '7'"> </td> <td align="center"><INPUT TYPE="button" NAME="eight" VALUE=" 8 " OnCLick="Calc.Input.value += '8'"> </td> <td align="center"><INPUT TYPE="button" NAME="nine" VALUE=" 9 " OnClick="Calc.Input.value += '9'"> </td> <td align="center"><INPUT TYPE="button" NAME="plus" VALUE=" + " OnClick="Calc.Input.value += ' + '"> </td> <td align="center"><b><INPUT TYPE="button" NAME="clear" VALUE=" C " OnClick="ClearEntry()"> </b> </td> </tr> <tr> <td align="center"><INPUT TYPE="button" NAME="four" VALUE=" 4 " OnClick="Calc.Input.value += '4'"> </td> <td align="center"><INPUT TYPE="button" NAME="five" VALUE=" 5 " OnCLick="Calc.Input.value += '5'"> </td> <td align="center"><INPUT TYPE="button" NAME="six" VALUE=" 6 " OnClick="Calc.Input.value += '6'"> </td> <td align="center"><INPUT TYPE="button" NAME="minus" VALUE=" - " OnClick="Calc.Input.value += ' - '"> </td> <td align="center"><input type="button" value=" ANS " name="CopyAns" OnClick="ANS()"> </td> </tr> <tr> <td align="center"><INPUT TYPE="button" NAME="one" VALUE=" 1 " OnClick="Calc.Input.value += '1'"> </td> <td align="center"><INPUT TYPE="button" NAME="two" VALUE=" 2 " OnCLick="Calc.Input.value += '2'"> </td> <td align="center"><INPUT TYPE="button" NAME="three" VALUE=" 3 " OnClick="Calc.Input.value += '3'"> </td> <td align="center"><INPUT TYPE="button" NAME="times" VALUE=" x " OnClick="Calc.Input.value += ' * '"> </td> <td align="center">  </td> </tr> <tr> <td align="center"><INPUT TYPE="button" NAME="zero" VALUE=" 0 " OnClick="Calc.Input.value += '0'"> </td><b><strong> <td align="center"><input type="button" value=" . " name="decimal" OnClick="Calc.Input.value+= '.'"> </strong></b></td> <td align="center">  </td> <td align="center"><INPUT TYPE="button" NAME="div" VALUE=" / " OnClick="Calc.Input.value += ' / '"> </td> <td align="center">  </td> </tr> </table> </div> </FORM> </center> </td> </tr> </table> <script language = "JavaScript"> function EntryValidation() { Calc.Output.value = eval (Calc.Input.value); } function ClearEntry() { Calc.Input.value= " "; Calc.Output.value= " "; } function ANS() { var temp = 0; temp = Calc.Output.value; Calc.Input.value = temp; } </script> <font color="#000000"> <font face="Verdana, Arial, Helvetica" size=2> <hr size="1"> </font> <p><font face="Verdana, Arial, Helvetica" size=2> <script> document.write("<Font color=ff8800>" + "Last updated: "+ "</font>" +document.lastModified); </script> </font></font> <table border="0" width="100%" cellspacing="1" cellpadding="5"> <tr> <td width="100%" align="center" bgcolor="#000080"><font face="Arial, Helvetica" size="2" color="#FFFFFF"><strong>Read Me</strong></font></td> </tr> </table> <p> <font face="Verdana, Arial, Helvetica" size=2> <font color="#FF0000">This application only works on IE, since Netscape doesn't support my JavaScript codes.</font>  </font> </p> <table border="0" width="100%" cellspacing="1" cellpadding="5"> <tr> <td width="100%" align="center" bgcolor="#000080"><font face="Arial, Helvetica" size="2" color="#FFFFFF"><strong>Help</strong></font></td> </tr> </table> <font face="Verdana, Arial, Helvetica" size=2> <p><font color="#FF0000"> </font><img border="0" src="inputbox.jpg" alt="Input Display box" width="126" height="23"> Input Display box. Max input: 16 characters</p> <p> <img border="0" src="outputbox.jpg" alt="Output the result" width="68" height="24"> Output the result, <br>  Max output: 10 digits</p> <p> <img border="0" src="equal.jpg" alt=" Get answer" width="47" height="24"> Get answer</p> <p> <img border="0" src="c.jpg" alt="Clear Input/Output box" width="48" height="23">  Clear Input/Output box, without hitting this button, previous result will continue use</p> <p> <img border="0" src="ANS.jpg" width="52" height="26"> Copy value from Output box into the Input box, treat it as a new input value, in case of new calculation</p> </font> <table border="0" width="100%" cellspacing="1" cellpadding="5"> <tr> <td width="100%" align="center" bgcolor="#000080"><font face="Arial, Helvetica" size="2" color="#FFFFFF"><strong>About</strong></font></td> </tr> </table> <p><font color="#000000" size="2" face="Arial">Project: <a href="http://www.engin.umd.umich.edu/CIS/course.des/cis525/js/index.html"> JavaScript Application</a><br> Class: <a href="http://www.engin.umd.umich.edu/CIS/course.des/cis525.html"> CIS 525 - Multimedia Web Design</a><br> Semester: Fall 2000, <a href="http://www.engin.umd.umich.edu/CIS">CIS</a> - <a href="http://www.umd.umich.edu">UM Dearborn</a><br> Professor: <a href="http://www.engin.umd.umich.edu/~bmaxim/index.html">Dr. Maxim</a></font></p> <p> <font color="#000000"> <center> <font face="arial, helvetica" size="2">©</font><font face="arial, helvetica" size="-2">  <font face="Verdana, Arial, Helvetica" size=2>2000, All Rights Reserved, <br> <a href="mailto:hwdeng@umich.edu">John Deng</a></font>, <a href="http://cyberrovers.com">Cyber Rovers, Inc.</a> </font></center></p> </body>