function loginchk()
{ 
	var doc=document.login;
	
	if(doc.username.value=="")
	{
		alert("Please enter username.");
		doc.username.focus();
		return false;
	}
	
	if(doc.password.value=="")
	{
		alert("Please enter password.");
		doc.password.focus();
		return false;
	}
return true;
}