function updateCaptcha() {
	var newRandomString = "";
	characters = new Array("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "y", "z");
	var inCharacters = characters.length;
	
		for(var i = 0; i < 10; i ++) {
		
			var thisRandomNumber = Math.floor(Math.random() * (inCharacters - 1));
			newRandomString = newRandomString + characters[thisRandomNumber];
		}
		
	document.getElementById("captchaImage").innerHTML = "<img src=\"/images/captcha/captcha.php?now=" + newRandomString + "\" />";
}