function check()
{
	var s=document.form1;
	 
 	if(s.username.value=="")
	{
	alert ("Please enter username");
	s.username.focus()
	s.username.select()
	return false;
	}
	if(s.password.value=="")
	{
	alert ("Please enter password");
	s.password.focus()
	s.password.select()
	return false;
	}
	document.form1.submit()
 }