Event.observe(window,'load',buildCaptcha);
function buildCaptcha(event){
	var form = $('feedbackform');
	var submits = form.getInputs('submit');
	for(var i=0; i<submits.length; i++){
		Event.observe(submits[i],'click',checkCaptcha,true);
	}
	var img = document.createElement('img');
	img.src='captcha/captcha.php?key=SmtNSzY=';
	img.alt='captcha image';
	Element.insert($('captcha'),img);
	Element.insert($('captcha'),document.createElement('br'));
	var input = document.createElement('input');
	input.id='captcha_val';
	input.name='captcha_val';
	input.type='text';
	Element.insert($('captcha'),input);
}

function checkCaptcha(event){
	var params={'captcha_val': $('captcha_val').value ,'key': 'SmtNSzY='};
	new Ajax.Request('captcha/captcha.php',
		{
			asynchronous: false,
			parameters: params,
			onSuccess: function(transport){
				if(transport.responseText=='true'){
				}else{
					alert('The letters do not match. Try again.');
					event.preventDefault();
				}
			},
			onFailure: function(){console.log('Cannot receive AJAX call.')}
		});
}