Hi,
You can edit the file "show_block_img" via the menu Display>Views to modify the image display with the code you want.
But I would rather recommend to use MagicZoom. Strict standard messages are not errors. It's just that your server is displaying these messages because the code of MagicZoom is a bit old for the recent versions of your software. In fact, you should never ever display such messages on a live website for security reasons as they are only for developers, not for users. You can easily turn them off by setting the "error reporting" option of the Joomla configuration to "none".