function recheck()
{ 
if (document.loginForm.username.value =="")
{
alert("Please fill in your user name!");
document.loginForm.username.focus();
return false;
}
var filter=/^\s*[.A-Za-z0-9_-]{4,15}\s*$/;
if (!filter.test(document.loginForm.username.value)) { 
alert("user name is error!"); 
document.loginForm.username.focus();
document.loginForm.username.select();
return false; 
} 
if (document.loginForm.userpwd.value =="") 
{
alert("Please fill in your password!");
document.loginForm.userpwd.focus();
return false; 
}
var filter=/^\s*[.A-Za-z0-9_-]{4,20}\s*$/;
if (!filter.test(document.loginForm.userpwd.value)) { 
alert("password is error!"); 
document.loginForm.userpwd.focus();
document.loginForm.userpwd.select();
return false; 
}
return true;
}
//-->