How to merge two <if condition> in one

[sadiq6210]

I want to display the adv. banners only in forumdisplay & showthread

I have two conditions

PHP Code:

<vb:if condition="THIS_SCRIPT=='forumdisplay'"> 


+

PHP Code:

<vb:if condition="THIS_SCRIPT=='showthread'"> 


How to merge it in one?

I tried this:

PHP Code:

<vb:if condition="THIS_SCRIPT=='forumdisplay' || 'showthread'"> 


But it is not working