Error url when add parameter

[eluser]misakitran[/eluser]
my structure folder :

control
--- frontend
--- product

view
--- frontend
--- product

in route file :

Code:

$route['product/(:num)'] = 'frontend/product';
$route['product'] = 'frontend/product';

browser routed right to my product control and product view
but my problem is :
- if i open "product" page (eg: i assign $id=3), url of images is : "http://www.mysite/data/product/1.png" => TRUE
- if i open "product/3" page, url of images is : "http://www.mysite/product/data/product/1.png" => FALSE

I tried all day, but not still found my mistake

PS: I use asset_help but it just return TRUE data/product/1.png)

[eluser]InsiteFX[/eluser]

Code:

$route['product/(:num)'] = 'frontend/product/$1';
$route['product'] = 'frontend/product';

[eluser]misakitran[/eluser]
I solved. Problem is url of image in asset_helper but I have to change relative url to full url
Have you any advice about this for me ?