if statement on customfield value

[Roman Delamare]

joomla 2.5
Virtuemart 2.0.2

Hi guys,

I'm trying to write an if statement on the customfields value.

What I'm trying to is to change the code on the "product detail page" form that:

<span class="product-fields-title">ISBN</span><span class="product-field-display">9782700034103</span>
to that

<span class="product-fields-title">ISBN</span><span class="product-field-display" itemprop="isbn">9782700034103</span>

I'm not gonna write what my first guess is because I totally suck at php.

[Roman Delamare]

I'm on Virtuemart 2.0.20b