function checkLogin(form){
	var username = document.getElementById("username").value;
	var password = document.getElementById("password").value;
	if (username == null || username == "") {
		alert("Please enter your username");
		document.getElementById("warning_username").innerHTML = "<span class='down'>Username required</span>";
		form.username.focus();
		return false;
	}
	else {
		document.getElementById("warning_username").innerHTML = "<span class='fade'>Username</span>";
	}
	
	if (password == null || password =="") {
		alert("Please enter your password");
		document.getElementById("warning_password").innerHTML = "<span class='down'>Password required</span>";
		form.password.focus();
		return false;
	}
	else {
		document.getElementById("warning_password").innerHTML = "<span class='fade'>Password</span>";
	}
	return true;
}