function disable(f)
{
	f.login.disabled=true;
	
}
function loginvalidate(f)
{
	if( f.login!=null)
	{
	disable(f)
	}
    if(f.username.value.length < 1 || f.password.value.length < 1)
    {
        if(f.username.value.length < 1 &&  f.password.value.length >= 1)
        {
            alert("Username required to log in.");
            //username missing
        }
        if(f.username.value.length >= 1 && f.password.value.length < 1)
        {
            alert("Password required to log in.");
            //password missing
        }
        if(f.username.value.length < 1 && f.password.value.length < 1)
        {
            alert("Username and Password required to log in.");
            //username and password missing
        }
if( f.login!=null)
		{
        f.login.disabled=false
		}
        return false;
    }
    else
    {
        return true;
    }
}