function check_captcha(){
	
	var error = 0;
	
	var captcha = document.getElementById('captcha').value.split(",");
	switch (captcha[2]){
		case "1":
			captcha = parseInt(captcha[0]) + parseInt(captcha[1]);
			captcha = captcha == document.getElementById('contactCaptcha').value ? true : false;
			break;
		case "2":
			captcha = parseInt(captcha[0]) - parseInt(captcha[1]);
			captcha = captcha == document.getElementById('contactCaptcha').value ? true : false;
			break;
		case "3":
			captcha = parseInt(captcha[0]) * parseInt(captcha[1]);
			captcha = captcha == document.getElementById('contactCaptcha').value ? true : false;
			break;
	}
	if(captcha && document.getElementById('contactCaptcha').value != ''){
		document.getElementById('contactCaptcha').style.backgroundColor = "#77B5DA";
	}else{
		error ++;
		document.getElementById('contactCaptcha').style.backgroundColor = "#aa93b8";
	}
	
	if(document.getElementById('contactName').value.length){
		document.getElementById('contactName').style.backgroundColor = "#77B5DA";
	}else{
		error ++;
		document.getElementById('contactName').style.backgroundColor = "#aa93b8";
	}
	
	if(document.getElementById('contactEmail').value.length){
		document.getElementById('contactEmail').style.backgroundColor = "#77B5DA";
	}else{
		error ++;
		document.getElementById('contactEmail').style.backgroundColor = "#aa93b8";
	}
	
	if(document.getElementById('contactEnquiry').value.length){
		document.getElementById('contactEnquiry').style.backgroundColor = "#77B5DA";
	}else{
		error ++;
		document.getElementById('contactEnquiry').style.backgroundColor = "#aa93b8";
	}
	
	return error > 0 ? false : true;
}


function displayCaptcha(num1, num2, operator){
	var ret = "";
	switch (operator){
		case '1':
			ret = num1+" + "+num2+" = ";
			break;
		case '2':
			ret = num1+" - "+num2+" = ";
			break;
		case '3':
			ret = num1+" * "+num2+" = ";
			break;
	}
	document.write(ret);	
}