PNG Fix

Allows the use of alpha transparent PNGs (both foreground and background) on MSIE 5.5-6. Works on elements that are loaded dynamically, as well as elements that use class names to toggle between different PNG backgrounds.

Read more about PNG Fix hacks and solutions.

Configuration

To use, the following three variables need to be configured:

1. transparentGIF - absolute path to the location of 1px x 1px transparent gif image.

    transparentGIF: '/images/spacer.gif',
   

   or

    transparentGIF: 'http://domain.com/images/spacer.gif',
   

2. foregroundPNGSelectors - comma separated CSS selectors (as you would specify in a css file) targeting elements using PNG in the foreground.

    foregroundPNGSelectors: 'img',
   

3. backgroundPNGSelectors - comma separated CSS selectors (as you would specify in a css file) targeting elements using PNG in the background.

   When png images are specified as the background image for elements in the css:

    #header {background: url('/images/header-background.png')}
    .comment {background: url('/images/comment-background.png')}
    #nav li {background: url('/images/nav-item-background.png')}
   

   Entry the selectors in a comma-separated list like this:

    backgroundPNGSelectors: '#header, .comment, #nav li',
   

Including the Script in HTML

After configuration, include this file in the portion of a page and limit the fix to IE 6 and below using conditional comments:

<!--[if lte IE 6]>
<script type="text/javascript" src="/javascripts/pngfix.js">
<![endif]-->

Note that background-position and background-repeat properties cannot be used, as the AlphaImageLoader filter does not support positioning and tiling of images.

However, this fix tries to mimic background-repeat by setting "sizingMethod" for the filter to "scale" if background-repeat is set to anything other than "no-repeat".

Credits

Adapted from: http://komodomedia.com/blog/index.php/2007/11/05/css-png-image-fix-for-ie

Contributors:

1. Beau Smith: Great work on enhancing the documentation.

Copyright (c) 2008 Jason Cheow, released under the MIT license