khosb/themes/default/blocks/checkout_plugin/third_party.tpl

<form id="checkout_form" name="checkout_form" method="post" action="">
	<input type="hidden" name="option" value="{$VAR.option}"/>
	{if $VAR.invoice_id == ''}
		{if $VAR.admin != '' && $VAR.account_id != ''}
			<input type="hidden" name="admin" value="1"/>
			<input type="hidden" name="do[]" value="checkout:admin_checkoutnow"/>
			<input type="hidden" name="_page" value="checkout:admin_checkout"/>
			<input type="hidden" name="account_id" value="{$VAR.account_id}"/>
		{else}
			<input type="hidden" name="do[]" value="checkout:checkoutnow"/>
			<input type="hidden" name="_page" value="checkout:checkout"/>
		{/if}
	{else}
		{if $VAR.admin != '' && $VAR.account_id != ''}
			<input type="hidden" name="admin" value="1"/>
			<input type="hidden" name="do[]" value="checkout:admin_checkoutnow"/>
			<input type="hidden" name="_page" value="checkout:admin_checkout"/>
			<input type="hidden" name="account_id" value="{$VAR.account_id}"/>
		{else}
			<input type="hidden" name="do[]" value="invoice:checkoutnow"/>
			{if $VAR.invoice_id > 0}
				<input type="hidden" name="_page" value="invoice:user_view"/>
			{else}
				<input type="hidden" name="_page" value="invoice:checkout_multiple"/>
			{/if}
		{/if}
		<input type="hidden" name="invoice_id" value="{$VAR.invoice_id}"/>
	{/if}

	<div>
		<p style="text-align: center;">If you are not redirected shortly, please <a href="#" onClick="checkoutNow();">click here to redirect</a>.</p>
		<input type="hidden" id="doredirect" value="true"/>
	</div>
</form>