function build_login_form() {
		
	$("#form_login").append(
		"<input type=\"text\" id=\"login_username\" name=\"sm_usr\" class=\"m200 medium\" />" + 
		"<input type=\"password\" id=\"login_password\" name=\"sm_pwd\" class=\"m200 medium\" />" +
		"<input type=\"submit\" id=\"login_submit\" value=\"\" class=\"btn\" />"
	);
	$("#form_login_container").css("display","block");
	$("#login_username").focus();
}

function clean_string(str) {
	if(str!="") {
		var tmp = str;
		var regExp = new RegExp("[^0-9-_a-zA-Z@\.]","gi");
		tmp = tmp.replace(regExp,"");		
		return tmp;
	}
}


function validate_login() {
	var usr = document.getElementById("login_username");
	var pwd = document.getElementById("login_password");
	if(usr.value != "" && pwd.value.length > 0) {
		usr.value = clean_string(usr.value);
		return true;
	} else { 
		return false;
	}
}