function login(showhide) {
	if (showhide == "show") {
		document.getElementById("popupbox").style.display="block"; /* If the function is called with the variable 'show', show the login box */
	} else if (showhide == "hide") {
		document.getElementById("popupbox").style.display="none"; /* If the function is called with the variable 'hide', hide the login box */
	}
}