function show_login_form(){
	if (document.getElementById("login_form").style.display == "none")
		document.getElementById("login_form").style.display = "block";
	else
		document.getElementById("login_form").style.display = "none";
}
//alert (document.getElementById("login_form").style.display);
function close_login_form(){
	document.getElementById("login_form").style.display = "none";
}