// JavaScript Document
// Check input is present
function checkInput(id) {
	var val = document.getElementById(id).value;
	if( val == '' ) {
		return true;
	} else {
		return false;
	}
}

function validate() {
	err = '';
	if (checkInput("name")) {
		err += '- Provide your name.\n';
	}
	if (checkInput("email")) {
		err += '- Provide your email address.\n';
	}
	if (checkInput("message")) {
		err += '- Provide a message.\n';
	}
	if (err) {
		alert('The following error(s) occurred:\n\n'+err);
		return false;
	} else {
		return true;
	}
}