[NeutralizeR]

I did it thanks to TECK.

vbulletin_global.js:

/**
* Function to resize an image used with the [IMG] bbcode tag
*
* @param    string    Image object
* @param    string    Image link
* @param    integer    Image max width
*/
function resize_image(obj, link, maxwidth)
{
    if (obj.width > maxwidth)
    {
        obj.style.cursor = 'pointer';
        obj.style.width = maxwidth + 'px';
        obj.style.height = parseInt(obj.height * maxwidth / obj.width) + 'px';
        obj.onclick = function()
        {
            window.location.href = link;
            return false;
        };
    }
}

/**
* Function to emulate document.getElementById

CSS:

.resize {
max-width: 728px; width: expression(this.width > 728 ? 728: true);
}

class_bbcode.php:

PHP Code:

return '<img class="resize" src="' .  $link . '" border="0" alt="" onload="resize_image(this, \'' .  $link . '\', 727);" />'; 


But unfortunately automatic linking to the original dimensions only work for IE and Opera. I at least need it for Firefox, too.

Test page:
http://www.msxlabs.org/forum/fantazi...r-2-a-202.html