separete login

[wMan]

i can't separete login window for all page
like change background seting it in php (from sintax it returns error because css can not be included)
here is input code

{elseif $args[1] == 'login'} 
    {if $validated} 
        {if $username!=null && $username!='Vartotojas'} 
            <p>{t k="tpl_user_login_invalid_1"}</p> 
            <p>{t k="tpl_user_login_invalid_2" a="user/reminder"|link}</p><br/><br/> 
        {/if} 
        {* Login *}
<div class="login_body"> 
        <form action="{link url="user/login"}" method="post" class="login"> 
            <div class="box">
<tr><td>Username:&nbsp;&nbsp;</td><td align=left><input type="text" name="user" maxlength="20" value="{$username}" /></td></tr> 
            </div> 
            <div class="spacer"></div> 
            <div class="box">
<tr><td>Password:&nbsp;&nbsp;</td><td align=left><input type="password" name="pass" maxlength="20" value="" /></td></tr> 
            </div> 
            <div class="spacer"></div> 
            <div class="box"> 
                <div class="nofloat"> 
                    {t k="tpl_user_login_forgot" a="user/reminder"|link}<br/> 
                    {t k="tpl_user_login_register" a="user/register"|link} 
                </div> 
            </div> 
            <div class="spacer"></div> 
            <div class="box"> 
                <input type="submit" value="{t k="tpl_user_login_submit"}" class="submit" /> 
            </div> 
            <div class="form_foot_rounded"></div> 
        </form>
</div>

and result attached
but i wan't to make it like all u can see is login window till u login