function IsItPresent(s,explanation)
{
	if(s.length) return s;
	alert('Please enter ' + explanation + '.');
	return '';

}


function CheckEmail(s_email)
{
	s_email = IsItPresent(s_email,'your email address');
	if(! s_email) return false;
	var i = s_email.indexOf(' ',0);
	while(i > -1)
	{
		s_email = s_email.substring(0,i) + 
			s_email.substring((i + 1),s_email.length);
		i = s_email.indexOf(' ',0);
	}

	document.orderinfo.email.value = s_email;
	if((s_email.length < 6) ||
	   (s_email.indexOf('@',0) < 1) ||
	   (s_email.lastIndexOf('@') != s_email.indexOf('@',0)) ||
	   (s_email.lastIndexOf('@') > (s_email.length - 5)) ||
	   (s_email.lastIndexOf('.') > (s_email.length - 3)) ||
	   (s_email.lastIndexOf('.') < (s_email.length - 4)) ||
	   (s_email.indexOf('..',0) > -1) ||
	   (s_email.indexOf('@.',0) > -1) ||
	   (s_email.indexOf('.@',0) > -1) ||
	   (s_email.indexOf(',',0) > -1))
	{
		alert('The email address "' + s_email + '" is not valid.');
		return false;
	}
	return true;
}

function dovalidate()

{
	if(CheckEmail(document.orderinfo.email.value) == false) return false;
	return true;

}