[Professor_Kan]

Many thanks for this code. It worked out great !!!

Here is the code for those of you whom wish to retain the default style sheet and main category link;

<font class=CategoriesList>
{section name=cat_num loop=$categories}

<a href="home.php?cat={$categories[cat_num].categoryid}" class=VertMenuItems>{$categories[cat_num].category_name}

<span class="sub" id="{$categories[cat_num].categoryid}">
{section name=subcat_num loop=$categories_data}
{if $categories_data[subcat_num].root_category_name == $categories[cat_num].category && $categories_data[subcat_num].category_name != $categories[cat_num].category_name}   
<a href="home.php?cat={$categories_data[subcat_num].categoryid}">
-{$categories_data[subcat_num].category_name}
{/if}

{/section}
</span>
{/section}



</A></font>