Session storage functions

namespace.getSession = function(key)
{
	return sessionStorage.getItem(key);
}

namespace.setSession = function(key, value)
{
	return sessionStorage.setItem(key, value);
}

namespace.hasSession = function(key)
{
	return myjs.getSession(key) != null;
}

namespace.removeSession = function(key)
{
	sessionStorage.removeItem(key);
}