$(document).ready(function(){
	 $.pngfix('media/mypixel.gif'); // this is optional
	 $('img[@src$=.png], #panel').pngfix().pngunfix();
});

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* UPDATE: 23-July-07

1. Plugin works fine with jQuery 1.1.3
2. Added support for working with sites implementing mod-rewrite (url-rewrite) (thanks to maserG)

View source
Example

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UPDATE: 20-July-07

1. Thanks to advice from J. Zaefferer & jonahfox, when specifying an URL via CSS, quotation marks are optional
match(/^url\(["']?(.*\.png)["']?\)$/i)

2. Thanks to advice from O. GENDRIN plugin now supports form image buttons

3. Unfortunately I found out that, there is no way of repeating png images in css as background when filter is applied. Scaling only scales, but not repeats backgroung image

View source
Example

$(document).ready(function(){
	 $('img[@src$=.png], #panel').pngfix();
	#$('img[@src$=.png], #panel').pngfix().pngunfix();
});

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1. Thanks to advice from J. Zaefferer isolated filtering operation and renamed plugin name to ...).pngfix();.

2. By request added function to remove the hack from selected items by simply ...).pngunfix();

View source
Example

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Method 3: appply png hack to both images in the DOM and css (ultimate method)
Special thanks to J. Zaefferer: bassistance.de ideas were taken from tooltip plugin

1. If given object is png image in the DOM:

• Apply AlphaImageLoader filter directly to png image
• Replace image src tag to point to empty pixel image

2. If given object has png image set as css background property:

• Apply AlphaImageLoader filter to object's css
• Set object's backgroundImage to empty

View source
Example

* usefull resource on IE png

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Method 1: Wrapping image in span and applying AlphaImageLoader filter to it

• Wrapping image in span
• Apply AlphaImageLoader filter to span
• Apply image attributes/styles to span if any
• Hide png image
• View source
• Example

Method 2: Applying AlphaImageLoader filter directly to image css

• Apply AlphaImageLoader filter directly to png image
• Replace image src tag to point to empty pixel image
• View source
• Example