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This calculator code can quickly determine the Greatest Common Factor and Least Common Multiplier between two or three numbers.

Label: GCD/LCM Calculator

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<script type="text/javascript">
<!-- Original: Seamus Yim -->

<!-- Begin
function go(input1,input2,input3){
  if (document.form1.text3.value!=""){
    document.form1.answer.value=hcf(hcf(input1,input2),input3);
    document.form1.answer2.value=lcm(lcm(input1,input2),input3);
  } else {
    document.form1.answer.value=hcf(input1,input2);
    document.form1.answer2.value=lcm(input1,input2);
  }
}

function hcf(text1,text2){
  var gcd=1;
  if (text1>text2) {text1=text1+text2; text2=text1-text2; text1=text1-text2;}
  if ((text2==(Math.round(text2/text1))*text1)) {gcd=text1}else {
   for (var i = Math.round(text1/2) ; i > 1; i=i-1) {
    if ((text1==(Math.round(text1/i))*i))
     if ((text2==(Math.round(text2/i))*i)) {gcd=i; i=-1;}
   }
  }
  return gcd;
}

function lcm(t1,t2){
  var cm=1;
  var f=hcf(t1,t2);
  cm=t1*t2/f;
  return cm;
}
//  End -->
</script>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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<form name="form1">
First Number:  <input type="text" name="text1" size="3">
  Second Number:  <input type="text" name="text2" size="3"><br>
  Third Number (<em>not required</em>):  <input type="text" name="text3" size="3">
<br><br>
<input type="button" value="Find GCF and LCM" onclick="go(eval(document.form1.text1.value),eval(document.form1.text2.value),eval(document.form1.text3.value))">
<br><br>
Greatest Common Factor (GCF):   <input type="text" name="answer" size="3" readonly>
<br>

Least Common Multiplier (LCM):   <input type="text" name="answer2" size="3" readonly>
</form>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->