function input_check() {
	var obj = document.getElementById("f");
	var str = "";

	// First Name
	if (obj.name.value == "") {
		str += "<p>-Please fill in &quot;First name&quot;.</p>\n";
	}

	// Last Name
	if (obj.name02.value == "") {
		str += "<p>-Please fill in &quot;Last name&quot;.</p>\n";
	}

	// Email Address
	if (obj.email.value == "") {
		str += "<p>-Please fill in &quot;Email address&quot;.</p>\n";
	}

	// Re-enter email address
	if ((obj.re_email1.value == "") || (obj.re_email2.value == "")) {
		str += "<p>-Please fill in &quot;Re-enter email address&quot;.</p>\n";
	} else {
		var mail = obj.re_email1.value + "@" + obj.re_email2.value;
		if (obj.email.value != mail) {
			str += "<p>-The two email addresses you entered did not match. Please carefully enter them again.</p>\n";
		}
	}

	// Phone number
	if (obj.tel.value != "") {
		if (!obj.tel.value.match(/^([0-9\_\(\)\-\+])+$/)) {
			str += "<p>-Please write your phone number using only western character encoding for the numbers and letters.</p>\n";
		}
	}

	// Type of question
	if (obj.type.value == "") {
		str += "<p>-Please choose &quot;Type of your question&quot;.</p>\n";
	}

	// your question
	if (obj.writing.value == "") {
		str += "<p>-Please enter your question.</p>\n";
	}

	if (str == "") {
		return true;
	} else {
		document.getElementById("err").innerHTML = str;
		return false;
	}
}