/* Make the images invisible and show the ALT instead */

img        { width: 0 !important;
             height: 0 !important }
img:before { content: "[" attr(alt) "]";	/* Show ALT text */
             color: #FF0 !important;		/* Show it in yellow on red */
             background: #F00 !important;
             margin: 0 0.33em !important }	/* Bit of space left & right */