function site_nav_checksubmit() {
	var frm = document.forms['site_nav_login'];
	if (frm.elements['username'].value == '') {
		alert("请输入用户名");		
		return false;		
	}
	if (frm.elements['logindomain'].value == '') {
		alert("请输入域名");
		return false;
	}
	if (frm.elements['password'].value == '') {
		alert("请输入密码");
		return false;
	}
	// 根据是否采用ssl, 决定submit的目的地
	if (frm.ssl.checked) {
		frm.action = "https://mail.biger.com.cn/cgi-bin/webmail.cgi";
	}

	frm.submit();
	return true;
}


function site_login()
{
	var content = '';
	
	content += '<FORM id="site_nav_login" name="site_nav_login" action="http://mail.biger.com.cn/cgi-bin/webmail.cgi"method="post">';
	content += '<table width="160" border="0" cellpadding="0" cellspacing="3" ID="Table1"><tr><td>·</td><td>用户名</td>';
	content += '<td><input name="username" type="text"  height = "10" size="12" ID="Text1"></td><td><input name="logindomain" type="hidden" ';
	content += 'value="biger.com.cn" ID="Hidden1"></td></tr><tr><td>·</td><td>密 &nbsp;码</td><td><input name="password" ';
	content += 'type="password"  height = "10" size="12" ID="Password1"></td></tr><tr><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;&nbsp;&nbsp;';
	content += '&nbsp;&nbsp;&nbsp;&nbsp; <input onClick="javascript:site_nav_checksubmit();" type="image" height="18" width="49"';
	content += 'src="images/bt01.gif" WIDTH="12" ID="Image6" NAME="Image6"></td></tr></table></FORM>';
	
	document.writeln(content);
}