function checkDecimals(fieldName, fieldValue, decimals) {

	if (fieldValue == "" || fieldValue == null)
		return true;

	if (isNaN(fieldValue)) {
		alert("That does not appear to be a valid number. Please try again.");
		fieldName.select();
		fieldName.focus();
		return false;
	}
	else {
			
		var regExp = '^[0-9]*(\.[0-9]{0,' + decimals + '})?$'
		var matchArray = fieldValue.match(regExp);
		if (matchArray == null) {
			alert ("Please enter a number with up to " + decimals + " decimal places. Please try again.");
			fieldName.select();
			fieldName.focus();
			return false;
		}
			
	}
	return true;
}