function insertFirefoxExt()
{
	if (window.navigator.userAgent.indexOf("Firefox")>=1)
	{
		document.getElementById('download').innerHTML = '<h1><a href="http://www.yeechat.com/download/yeechat.xpi" target="_blank"><img src="image/add2.gif" border="0"></a></h1>';
	}
}

function unsetNickName()
{
	if(document.getElementById('user').value == "guest")
	{
		document.getElementById('user').value = "";
	}
}

function setNickName()
{
	if(document.getElementById('user').value == "")
	{
		document.getElementById('user').value = "guest";
	}
}
insertFirefoxExt();