/* Browser Compatibility */
isIE6 = is_firefox = is_chrome = is_safari = is_ie8 = false;
if ((navigator.userAgent.toLowerCase().indexOf('ie 6')!=-1) && (navigator.userAgent.toLowerCase().indexOf('ie 7')==-1)) isIE6 = true;
if (navigator.userAgent.toLowerCase().indexOf("firefox")!=-1) is_firefox = true;
else if (navigator.userAgent.toLowerCase().indexOf('chrome')!=-1) is_chrome = true;
else if (navigator.userAgent.toLowerCase().indexOf('safari')!=-1) is_safari = true;
else if (navigator.userAgent.toLowerCase().indexOf('ie 8')!=-1) { is_ie8 = true; isIE6 = false; }

function $m(quem){
	return document.getElementById(quem);
}
function $h(hide, show) {
	if (hide) $m(hide).style.display = "none";
	if (show) $m(show).style.display = "";
}

prevswtab = "welcome";
function switchtab(tab) {
	$h(prevswtab, tab);
	prevswtab = tab;
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	} else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}