// check form values
function checkForm()
{
	// instantiate object
	fv = new formValidator();
	
	// perform checks
	
//check that email is valid
	if (fv.isEmpty(document.forms[0].listAddress.value))
	{
		fv.raiseError("enter a valid email address");
	}
	if (!fv.isEmpty(document.forms[0].listAddress.value) && !fv.isEmailAddress(document.forms[0].listAddress.value))
	{
		fv.raiseError("enter a valid email address");
	}
// all done

	// if errors, display, else proceed
	if (fv.numErrors() > 0)
	{
		fv.displayErrors();
		return false;
	}
	else
	{
		return true;
	}
	
}