Javascript Calculator!

Description: Works just like a windows calculator. Looks great in Internet Explorer but terrible in Netscape Navigator. I wrote this script just for the heck of it. The first program I ever wrote in college was a Calculator in VB and I don't think I ever got it working so maybe that's why I decided to write this one. Use it for what ever you'd like free or commercial. Just be sure to give me back a link to my site.
Features: Windows Calculator

Example:

Calculator

Click Here to Copy contents to your Clipboard

<form name=me> <input type=hidden name=dafunction value=""> <input type=hidden name=tempnum value=""> <input type=hidden name=daboo value=""> <input type=hidden name=memob value="0"> <script language=javascript> <!--// //script written by Jason J. Russo //more free scripts: http://thescriptcenter.com function numbers(x) { var daboo= document.mef.daboo.value; var dafunction = document.mef.dafunction.value; var deccheck = document.mef.results.value; if(document.mef.results.value == "0" && deccheck.indexOf('.')=="-1") { document.mef.results.value = ""; } if(daboo != "true") { document.mef.results.value=document.mef.results.value+x; } else { document.mef.results.value=x; document.mef.daboo.value=""; } } function add() { if(document.mef.tempnum.value){ gofigure(); } document.mef.dafunction.value='+'; document.mef.daboo.value='true'; document.mef.tempnum.value=document.mef.results.value; } function subtract() { if(document.mef.tempnum.value){ gofigure(); } document.mef.dafunction.value='-'; document.mef.daboo.value='true'; document.mef.tempnum.value=document.mef.results.value; } function multiply() { if(document.mef.tempnum.value){ gofigure(); } document.mef.dafunction.value='*'; document.mef.daboo.value='true'; document.mef.tempnum.value=document.mef.results.value; } function divide() { if(document.mef.tempnum.value){ gofigure(); } document.mef.dafunction.value='/'; document.mef.daboo.value='true'; document.mef.tempnum.value=document.mef.results.value; } function oneoverx() { document.mef.results.value=1/eval(document.mef.results.value); } function percenta() { var whatdo = document.mef.dafunction.value; var percnumber = document.mef.results.value / 100; if(document.mef.tempnum.value){ document.mef.results.value = eval(document.mef.tempnum.value)*percnumber; } else { document.mef.results.value = "0"; } document.mef.tempnum.value=""; document.mef.dafunction.value=""; } function squaroot() { document.mef.results.value=Math.sqrt(document.mef.results.value); } function plusminus() { var xy = document.mef.results.value; if(xy == "0"){ return false; } if(xy.indexOf("-") == "0") { xy = xy.substring(1,xy.length); } else { xy = "-" + xy; } document.mef.results.value = xy; } function backspace() { //ignore if zero already.// if(document.mef.results.value=="0") { return false; } //length of the text field// var numlength = document.mef.results.value; //subtract one.// var newresult = numlength.length-1; //set to new value -1;// document.mef.results.value = numlength.substring(0,newresult); //set to zero if nothing left. if(document.mef.results.value=="") {document.mef.results.value ="0";} } function clearfu() { document.mef.tempnum.value=""; document.mef.results.value="0"; document.mef.dafunction.value=""; } function gofigure() { if(document.mef.tempnum.value==".") { return false; } var whatdo = document.mef.dafunction.value; if(whatdo=="+"){ document.mef.results.value = eval(document.mef.results.value) + eval(document.mef.tempnum.value); } else if(whatdo=="-"){ document.mef.results.value = eval(document.mef.tempnum.value)-eval(document.mef.results.value); } else if(whatdo=="*"){ document.mef.results.value = eval(document.mef.results.value) * eval(document.mef.tempnum.value); } else if(whatdo=="/"){ document.mef.results.value = eval(document.mef.tempnum.value)/eval(document.mef.results.value) ; } document.mef.tempnum.value=""; document.mef.dafunction.value=""; } //--> </script> <table style="border-style:inset;border-width:2px;" bgcolor=#CCCCCC><tr> <td><font face=verdana color=white><B>Calculator</b></td></tr><tr> <td><input type=text value="0" size=33 name=results></td> </tr> <tr><td> <input type=text name=memry style="background-color:#CCCCCC;" size=2> <input type=button value="Backspace" style="background-color:#CCCCCC;color:red;width:67px;height:27px;font-size:10px;" OnClick="backspace()"> <input type=button value="CE" style="background-color:#CCCCCC;color:red;width:67px;height:27px;font-size:10px;" OnClick="clearfu()"> <input type=button value=" C " style="background-color:#CCCCCC;color:red;width:57px;height:27px;font-size:10px;" OnClick="clearfu()"> </td></tr><tr> <td> <input type=button style="background-color:#CCCCCC;color:red;width:35px;height:27px;font-size:10px;" value="MC" OnClick="document.mef.memry.value=' ',document.mef.memob.value='0'">   <input type=button value="7" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(7)"> <input type=button value="8" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(8)"> <input type=button value="9" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(9)"> <input type=button style="background-color:#CCCCCC;color:red;width:35px;height:27px;font-size:10px;" value="/" OnClick="divide()"> <input type=button style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" value="sqrt" OnClick="squaroot()"> </td></tr><tr> <td> <input type=button style="background-color:#CCCCCC;color:red;width:35px;height:27px;font-size:10px;" value="MR" OnClick="document.mef.results.value=document.mef.memob.value">   <input type=button value="4" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(4)"> <input type=button value="5" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(5)"> <input type=button value="6" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(6)"> <input type=button style="background-color:#CCCCCC;color:red;width:35px;height:27px;font-size:10px;" value="*" OnClick="multiply()"> <input type=button style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" value="%" OnClick="percenta()"> </td></tr> <tr> <td> <input type=button style="background-color:#CCCCCC;color:red;width:35px;height:27px;font-size:10px;" value="MS">   <input type=button value="1" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(1)"> <input type=button value="2" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(2)"> <input type=button value="3" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(3)"> <input type=button style="background-color:#CCCCCC;color:red;width:35px;height:27px;font-size:10px;" value=" - " OnClick="subtract()"> <input type=button style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" value=" 1/x " OnClick="oneoverx()"> </td> </tr><tr> <td> <input type=button style="background-color:#CCCCCC;color:red;width:35px;height:27px;font-size:10px;" value=" M+ " OnClick="document.mef.memry.value=' M',document.mef.memob.value=document.mef.results.value;">   <input type=button value="0" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers(0)"> <input type=button value="+/-" style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="plusminus() "> <input type=button value="." style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" OnClick="numbers('.')"> <input type=button style="background-color:#CCCCCC;color:red;width:35px;height:27px;font-size:10px;" value="+" OnClick="add()"> <input type=button style="background-color:#CCCCCC;color:blue;width:35px;height:27px;font-size:10px;" value="=" OnClick="gofigure()"> </td></tr> <tr><td> </td></tr> </table> </form>