function fnMakeCaptcha() {
	var chars = "2345679ABCDEFGHIJKLMNPQRSTUVWXTZabcdefghikmnopqrstuvwxyz";
	var string_length = 6;
	captchastr = '';
	for (var i=0; i<string_length; i++) {
		var rnum = Math.floor(Math.random() * chars.length);
		captchastr += chars.substring(rnum,rnum+1);
	}
	$('#captchalabel').text(captchastr);
	$('#ctl00_yellowbox_Txtcaptchaval').val('az'+captchastr+'za');
	$('#ctl00_yellowbox_Txtcaptchacode').val('');
}