<!-- Code taken from ccbn documentation and example calculator site
	
function validatemoney(f) 
	{
	var number= f.investment.value;
	if (number.length == 0)
		return;
	if (number.charAt(0)=="$")
		number = number.substring(1, number.length);
	if (isnumeric(number))
		f.shrs_bt.value='';
	else
		{
		alert("Please input a valid number!");
		f.investment.focus()
		}
	}

function validateshares(f) 
	{
	var number= f.shrs_bt.value;
	if (number.length == 0)
		return
	else if (isnumeric(number))
		f.investment.value='';
	else
		{
		alert("Please input a valid number!");
		f.shrs_bt.focus()
		}
	}

function isnumeric(number)
	{
	var commaindex = 0;
	var regexp=/\d/;
	var ok=true;

	//First character must be a numeric
	if (!regexp.test(number.charAt(0)))
		return false;

	//validate commas in the string
	regexp=/\d{3}/;
	if (number.indexOf(",",commaindex)>-1)
		{
		while (number.indexOf(",",commaindex)>-1)
			{
				commaindex = number.indexOf(",",commaindex);
							
				if (number.length <= commaindex + 4)
					return false;
				if (!regexp.test(number.substring(commaindex+1, commaindex+4)))
					return false;
				commaindex = commaindex + 4
			}
		comma = /,/g;
		number = number.replace(comma,'');
		}				

	regexp=/(^\d+$)|(^\d+\.\d+$)/;
	return regexp.test(number)
	}
// -->