/*******************************************************************************

Author:  David L. Burkhart (www.BurkhartTech.com)

Brief Description:

	This script will transform all PNG format images to enable transparency for 
for Internet Explorer.

Full Description:

	Internet Explorer 4, 5, and 6 does not natively support the alpha channel
(transparency) for 32-bit PNG format images.  Internet Explorer appears to 
simply ignore the alpha channel for these images, rendering them as completely
opaque.  This script provides a quick and easy way to fix this problem for most 
web pages.  
	This script uses a DirectX API, so therefore requires DirectX to work.  I 
don't know which versions of DirectX is required.  
	This script also requires a 1-pixel tranparent GIF image.  This script 
as-is looks for one called "Nothing.gif".  Rename it however you prefer.  And, 
if anyone can figure out a better way to hide the old image, please let me 
know.  

*******************************************************************************/	

window.onload = ConvertAlphaImages;

function ConvertAlphaImages() {
	// Windows browser only
	if ( document.all ) {
		var ImageCnt = document.images.length;
		var Image;
		// Loop for all images
		for ( var x=0; x<ImageCnt; x++ ) {
			Image = document.images[x];
			// Image file extension is ".png"
			if ( ( Image.src.length>=4 ) && ( Image.src.substr( Image.src.length - 4, 4 ).toLowerCase() == ".png") ) {
				Image.style.width = Image.clientWidth;
				Image.style.height = Image.clientHeight;
				Image.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader( src='" + Image.src + "', sizingMethod='scale' )";
				Image.src = "Scripts/EmptyPixel.gif"; // Hide old image
				} // end if
			} // end for
		} // end if
	} // end function