facebook share problem !

[ot_bg_sam]

Hello people , i have big problem . It's about a site that next pictures with a few thumnails and a main pictue that is loaded from db with this code :

 

<img src="<?PHP echo $row['path'];?>" alt="<?PHP echo $row['name'];?>" title="<?PHP echo $row['detail'];?>"/>

 

all works fine , but the share button is problem , when I try to share the main picture from the page  , and facebook share windows loads all the pictures (thumbnails , ads , arrows )  except the main picture. what I have to add , to make facebook finds my main pic thank you so much. sorry for my not excellent english. cheers.