1. Copy and paste the following between your HEAD tags:-

    
<script language="javascript">
function GetResults(){
rate=MQY.rate.value/100;
deci=MQY.dec.value;
if (MQY.Radio1[2].checked==true)
{month=(Math.pow((1+rate),1/3)-1)*100;
year=(Math.pow((1+rate),4)-1)*100;
FIRST.innerHTML="Monthly Rate ===>>> "+round2(month,deci)+" %";
SECOND.innerHTML="Yearly Rate ===>>> "+round2(year,deci)+" %"}

if (MQY.Radio1[1].checked==true)
{quarter=(Math.pow((1+rate),3)-1)*100;
year=(Math.pow((1+rate),12)-1)*100;
FIRST.innerHTML="Quarterly Rate ===>>> "+round2(quarter,deci)+" %";
SECOND.innerHTML="Yearly Rate ===>>> "+round2(year,deci)+" %"}

if (MQY.Radio1[0].checked==true)
{month=(Math.pow((1+rate),1/12)-1)*100;
quarter=(Math.pow((1+rate),1/4)-1)*100;
FIRST.innerHTML="Monthly Rate ===>>> "+round2(month,deci)+" %";
SECOND.innerHTML="Quarterly Rate ===>>> "+round2(quarter,deci)+" %"}
}

function RadioCheck(){
if (MQY.Radio1[0].checked==true)
{MQY.GRS.value="Get The Monthly & Quarterly Rates"}
}

function RadioCheck1(){
if (MQY.Radio1[1].checked==true)
{MQY.GRS.value="Get The Quarterly & Yearly Rates"}
}

function RadioCheck2(){
if (MQY.Radio1[2].checked==true)
{MQY.GRS.value="Get The Monthly & Yearly Rates"}
}

function select_area()
{MQY.rate.select()}

function select_area1()
{MQY.dec.select()}

function round2(nbr,digits){
nbr=nbr.toString()
if (nbr.indexOf(".")==-1)
{int_part=nbr
decimal_part=""}
else
{int_part=nbr.substring(0,nbr.indexOf("."))
decimal_part=nbr.substring(1+nbr.indexOf("."),2+nbr.indexOf(".")+digits)}
while(decimal_part.length<digits+1)
decimal_part+="0"
if (Number(decimal_part.charAt(decimal_part.length-1)<5))
decimal_part=decimal_part.substring(0,digits)
else
{decimal_part=(Number(decimal_part)+10).toString()
if (decimal_part.length>digits+1){
int_part=(Number(int_part)+1).toString()
decimal_part=decimal_part.substring(1,digits+1)}
decimal_part=decimal_part.substring(0,digits)}
if (int_part=="")
int_part=0;
if (Number(digits)>0)
return int_part+"."+decimal_part
else
return int_part
}
</script>

*********************************
2. Copy and paste the following code between your BODY tags where you want the input displayed:
<div style="position:absolute; left:250; top:200">
<center><table width=90% border=0 bordercolor=#ffff00 cellspacing="0" cellpadding="10"><tr><td>

<fieldset>
<legend align="center" style="font-size:12pt">Equivalent Interest Calculator</legend>

<fieldset>
<div id="inrest" colspan=6 align="center" style="color:#ff00ff;font-size:11pt">Input Interest Percentage</div>
<p align="center"><input type="text" style="text-align:center;color:#0000ff" name="rate" size=15 onKeyPress="if ((event.keyCode<46) || (event.keyCode>57)) event.returnValue=false" onClick="select_area()" onKeyUp="GetResults()">
</fieldset>

<br>
<fieldset>
<p align="center" style="color:#ff00ff;font-size:11pt">Select If The Percentage Is Yearly, Monthly or Quarterly</p>
<p colspan=6 align="center">
<label for="Year"><span style="color:#0000ff">Yearly Rate</span></label>
<input type="radio" name="Radio1" id="Year" onClick="RadioCheck()">
  
<label for="Month"><span style="color:#0000ff">Monthly Rate</span></label>
<input type="radio" name="Radio1" id="Month" onClick="RadioCheck1()">
  
<label for="Quarter"><span style="color:#0000ff">Quarterly Rate</span></label>
<input type="radio" name="Radio1" id="Quarter" onClick="RadioCheck2()">
</fieldset>

<br>
<fieldset>
<p align="center" style="color:#ff00ff;font-size:11pt">Required Number Of Decimal Points
<p align="center"><input type="text" style="text-align:center;color:#0000ff" name="dec" value=4 size=5 onKeyPress="if ((event.keyCode<48) || (event.keyCode>57)) event.returnValue=false" onClick="select_area1()" onKeyUp="GetResults()">
</fieldset>

*********************************
Please Note
You can display where ever you like. You change the "left" and "top" values in the opening "div" tag above to whatever values you need. 
a) "top" is the vertical distance of the top left corner of the display starting at zero. The higher the number the lower down the page.
b) "left" is the horizontal distance of the top left corner of the display starting at zero. The higher the number the further across the page.
c) You can change also the color of the display and the background.

If you have any problems or questions please email us at info@datedial.com.

Linking Information:-
TITLE : Equivalent Interest Rate
URL : http://www.datedial.com/Equivalent_Interest_Rate.asp
DESCRIPTION : Calculate equivalent interest rates