function validateForm() {
	var error_msg = "";
		if (document.getElementById("fullname").value.length==0) {
			error_msg =error_msg+"Name is a required field.\n";
		}
		if (document.getElementById("email").value.length==0) {
			error_msg = error_msg+"Email is a required field.\n";
		}
		if (document.getElementById("message").value.length==0) {
			error_msg = error_msg+"Message is a required field.\n";
		}

		var phone = document.getElementById("phone").value;
		var _isValidPhone = phone.match(/^[\d\.\s\-]+$/);
		if (phone && !_isValidPhone) {
			error_msg = error_msg+"Phone is invalid.\n";
		}
		var email = document.getElementById("email").value;
		var _isValidEmail = email.match(/^[\w-\.]+\@[\w\.-]+\.[a-z]{2,4}$/);
		if (email && !_isValidEmail) {
			error_msg = error_msg+"Email is invalid.\n";
		}
		if (document.getElementById("inputbox").value.length==0) {
			error_msg = error_msg+"verify image is a required field.\n";
		}
		
	if (error_msg != "") {
		alert(error_msg);
		return false;
	}
	else {
		return true;
	}
}