Changing a True / False Statement to Something Else

First, I am sorry if this is a total newb question, but I know nothing about Javascript and so I am hoping that someone here might be able to help me.

I have been trying to change my checkout page on my ecommerce site to have some drop downs so that people can choose to either login, register, or checkout as a guest.

This is my entire checkout_login.tpl code:

{* $Id: checkout_login.tpl 5099 2008-04-07 13:20:27Z zeke $ *}

<script type="text/javascript" language="javascript 1.2">
//<![CDATA[

function fn_switch_checkout_type(status)
{$ldelim}
	{if $checkout_type == 'classic'}
		{literal}
		var elms = ['email','user_login_profile','password1','password2'];
		var k;

		for (k in elms) {
			if (status) {
				profiles_form.set_required_fields(elms[k]);
				if (document.getElementById(elms[k])) {
					//document.getElementById(elms[k]).value = '';
				}
			} else {
				profiles_form.uset_required_fields(elms[k]);
			}
		}
		fn_show_tag('profiles_auth', true);
		fn_show_tag('profiles_box', false);
		fn_show_tag('account_box', !status);
		{/literal}
	{else}
		
		
		{literal}

		if (status == true) {
			fn_show_tag('step_one_register', false);
		} else{
			fn_show_tag('step_one_anonymous_checkout', false);
		} 
		fn_show_tag('step_one_login', true);
		
		{/literal}
	{/if}
{$rdelim}
//]]>
</script>

<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
	<td width="50%" valign="top">
	{assign var='result_ids' value="'sign_io', 'cart_items','checkout_totals','checkout_steps', 'cart_status'"}
	{if $settings.Addons.promotions == 'Y'}
		{assign var='result_ids' value=$result_ids|cat:",'convenient_promotion'"}
	{/if}
	<!--{include file="auth_pages/login.tpl" nothing_extra='Y' form_name='step_one_login_form' form_alias='solf' result_ids=$result_ids checkout_login='Y' on_login_click="solf.callback = function ()$ldelim window.location.hash = '#checkout_top' $rdelim;"}
	</td>
	<td width="50%" valign="top" style="padding-left: 10px;">-->
		{if $settings.General.approve_user_profiles != 'Y'}
		
        
        <div class="style45">{$lang.text_has_an_account}</div>
		<div class="buttons-wrapper">{include file="buttons/button.tpl" but_onclick="fn_switch_checkout_type(true);" but_text=$lang.login}</div>
        <div style="height: 1px; background: #ffffff url('{$images_dir}/sidebox_delim.gif') repeat-x top; margin: 15px 0px 8px 0px;"></div>
        
        <div class="style45">{$lang.text_dont_have_an_account_full}</div>
		<div class="buttons-wrapper">{include file="buttons/button.tpl" but_onclick="fn_switch_checkout_type(true);" but_text=$lang.register}</div>
		{/if}
		{if $settings.General.disable_anonymous_checkout != 'Y'}
		<div style="height: 1px; background: #ffffff url('{$images_dir}/sidebox_delim.gif') repeat-x top; margin: 15px 0px 8px 0px;"></div>
		<div class="style45">
        {$lang.text_dont_want_to_register_an_account}</div>
		<div class="buttons-wrapper">{include file="buttons/button.tpl" but_onclick="fn_switch_checkout_type(false);" but_text=$lang.checkout_as_guest}</div>
		{/if}
	</td>
</tr>
</table>

Code (markup):

The part I am trying to change is:

{literal}
		
		if (status == true) {
			fn_show_tag('step_one_register', false);
		} else{
			fn_show_tag('step_one_anonymous_checkout', false);
		} 
		fn_show_tag('step_one_login', true);
		
		{/literal}

Code (markup):

and:

<div class="style45">{$lang.text_has_an_account}</div>
		<div class="buttons-wrapper">{include file="buttons/button.tpl" but_onclick="fn_switch_checkout_type(true);" but_text=$lang.login}</div>
        <div style="height: 1px; background: #ffffff url('{$images_dir}/sidebox_delim.gif') repeat-x top; margin: 15px 0px 8px 0px;"></div>
        
        <div class="style45">{$lang.text_dont_have_an_account_full}</div>
		<div class="buttons-wrapper">{include file="buttons/button.tpl" but_onclick="fn_switch_checkout_type(true);" but_text=$lang.register}</div>
		{/if}
		{if $settings.General.disable_anonymous_checkout != 'Y'}
		<div style="height: 1px; background: #ffffff url('{$images_dir}/sidebox_delim.gif') repeat-x top; margin: 15px 0px 8px 0px;"></div>
		<div class="style45">
        {$lang.text_dont_want_to_register_an_account}</div>
		<div class="buttons-wrapper">{include file="buttons/button.tpl" but_onclick="fn_switch_checkout_type(false);" but_text=$lang.checkout_as_guest}</div>

Code (markup):

The part that I am having troubles figuring out how to change is:

<div class="style45">{$lang.text_has_an_account}</div>
		<div class="buttons-wrapper">{include file="buttons/button.tpl" but_onclick="fn_switch_checkout_type(true);" but_text=$lang.login}</div>
        <div style="height: 1px; background: #ffffff url('{$images_dir}/sidebox_delim.gif') repeat-x top; margin: 15px 0px 8px 0px;"></div>

Code (markup):

Basically I need to change the fn_switch_checkout_type(true) to something else that won't conflict with the other 2 options.

If any one can help I would really appreciate it. If anyone needs more info like a link or something I will be happy to provide one.

Thank you in advance for your help,

Brandon