window.addEvent('domready', function(){
	var loginbox;
	loginbox = new Fx.Slide('loginbox', {duration:500}); 
	loginbox.hide();//start with loginbox closed
	$('loginbox').style.display="";//loginbox is completely hidden incase of javascript is disabled, this makes it shown again
	$('loginbutton').addEvent('click', function(e){ e = new Event(e); loginbox.toggle(); $('usuario').focus(); e.stop(); });
});

function msieversion() {
	var ua = window.navigator.userAgent
	var msie = ua.indexOf ( "MSIE " )
	
	if ( msie > 0 )      // If Internet Explorer, return version number
		return parseInt (ua.substring (msie+5, ua.indexOf (".", msie )))
	else               // If another browser, return 0
		return 0;
}