help with zc image function

I need to add ajax zoom effect to my image .. however, i have a bit of problem doing so , due to lack of understanding zc function .

need to add additional element called longdesc to <img> tag.
this element should contain path to large image.

currently trying to add this zoom effect to product all listing .
code that needed to be modified is :

  ```php
$display_products_image = '<a href="' . zen_href_link(zen_get_info_page($products_all->fields['products_id']), 'cPath=' . zen_get_generated_category_path_rev($products_all->fields['master_categories_id']) . '&products_id=' . $products_all->fields['products_id']) . '">' . zen_image(DIR_WS_IMAGES . $products_all->fields['products_image'], $products_all->fields['products_name'], IMAGE_PRODUCT_ALL_LISTING_WIDTH, IMAGE_PRODUCT_ALL_LISTING_HEIGHT) . '</a>' . str_repeat('<br clear="all" />', substr(PRODUCT_ALL_LIST_IMAGE, 3, 1));

so i need to add $parama=longdesc = zen_images() after IMAGE_PRODUCT_ALL_LISTING_HEIGHT . but i have no idea how . tried many ways but ended up with all kinda problems. 

any information would be appreciate. 

thanks.

You can add custom additional parameters by adding a 5th parameter to the zen_image() function call.
However, keep in mind that it's unwise to disclose server-side path details to visitors ... so, if your ajax script is relying on you specifying complete paths, then you're engaging in unwise coding practices as far as security is concerned.

Further, while I've not checked the w3c spec about this and I could be wrong in this thought, but isn't "longdesc" intended to be used for something of a useful meaning to the person viewing the page? Putting a "path" in there seems like it's contrary to the intent of that element's use.

thanks ..

the idea is to have something like this ..

I am not the author of this script but this script called fullsize and can be found pretty easy on the net and all the information regarding this is there ..

so , how can i construct that ??

add a 5th parameter: ```
, 'longdesc=" . $path_to_my_image . "'

You'll have to build the right value for the $path_to_my_image variable, by writing custom code to look up the right details.

ouch .. :unsure:
Thanks. will try to come up with something