var links = document.getElementsByTagName("a");
for( var i = 0; i < links.length; i++ )
{
	if( /(jp[e]?g|png|gif)$/i.test( links[i].href ) && /\s*<img[^>]+>\s*$/i.test( links[i].innerHTML ) )
	{
		links[i].innerHTML += "<img src='/blog/wp-content/images/zoom.gif' width=23 height=24 style='position: relative; left: -23px;' />";
	}
}