function displayMMValue()
	{
		var conversionType	= document.conversionForm.convertFrom.value;
		var conversionValue	= document.conversionForm.conversionValue;
		var mm					= document.conversionForm.mmValue;

		if ( conversionValue.value == '' )
		{
			alert('Please enter a value to convert from');
			conversionValue.focus();
			mm.value='';
			return false;
		}

	if (isNaN(conversionValue.value)) {
	    alert('Please enter a positive numeric value to convert from');
	    conversionValue.focus();
	    mm.value = '';
	    return false;
		}

		mm.value = getMMValue(conversionType, conversionValue.value);
	}

	function getMMValue(conversionType, conversionValue)
	{
		var conversionFactor;
		switch(conversionType)
		{
			case 'inches':
				conversionFactor = 25.4;
				break;
			case 'feet':
				conversionFactor = 304.8;
				break;
			case 'yards':
				conversionFactor = 914.4;
				break;
			case 'centimeters':
				conversionFactor = 10;
				break;
			case 'meters':
				conversionFactor = 1000;
				break;
		}
		return r2( conversionFactor * conversionValue );
	}

	function r2(n)
	{
	  ans = (Math.round(n * 100))/100 + ""
	  dot = ans.indexOf(".",0)
	  if (dot == -1) {ans = ans + ".00"}
	  else if (dot == ans.length - 2) {ans = ans + "0"}
	  return ans
	}