function CheckUserName(){ 

if (trim(document.f1.username.value) == ""){ 
alert('请输入您的用户名!'); 
document.f1.username.focus(); 
return false; 
} 
if (trim(document.f1.password.value)== ""){ 
alert('请输入您的用户密码!'); 
document.f1.password.focus(); 
return false; 
} 
document.f1.ToUrl.value="http://note.ssreader.com/check.asp?expdate="+document.f1.expires_date.value
document.f1.Button1.disabled=true;
document.f1.Button1.value="请稍候";
//document.f1.action="http://reg.ssreader.com/UserLogin.asp"; 
document.f1.submit(); 
return true; 
}
function GetSumitFocus()
{
	if(event.keyCode==13)
	{
		document.Form1.Button1.focus(); 
	}
}
 
//去左空格; 
function ltrim(s){ 
return s.replace( /^\s*/, ""); 
} 
//去右空格; 
function rtrim(s){ 
return s.replace( /\s*$/, ""); 
} 
//去左右空格; 
function trim(s){ 
return rtrim(ltrim(s)); 
}