[nerbert]

Seems to do it

var password = fetch_object('fm_login_password');
if(typeof localStorage == 'object'){
	window.onload = function(){		
		setTimeout("if(PassWord = localStorage.getItem('fmpassword')) {password.value = PassWord; password.focus();}", 100)
	}
	password.form.onsubmit = function() {
		localStorage.setItem('fmpassword', password.value);
	}
} else {
	password.value = '';
}

Thanks