var SIDString = '';

function getRandomLetter() {
	return String.fromCharCode(getRandom(65, 90));
}

function getRandom(lowerBound, upperBound) {
	return Math.floor((upperBound - lowerBound + 1) * Math.random() + lowerBound);
}

function SetSID() {
	if (SIDString.length > 0) {
		return SIDString;
	}
	sidc = 0;
	while (sidc < 32)	{
		SIDString = SIDString + getRandomLetter();
		sidc++;
	}
	return SIDString;
}

var url = "http://www.atmosphericzone.com/newsletters/admin/resources/form_designs/captcha/index.php?c=" + getRandom(1,1000)+ "&ss=" + SetSID();
document.write("<img src='" + url + "' alt='img'/>");