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 This article has been translated to Polish, available at mambopl.com
When I was starting to add content to the andy-stewart.com website, I decided to change some of the standard Mambo icons and images with my own - to give it a more personal touch. I had recently purchased a heap of icon images in PNG format, and decided to use these. Another reason for using the PNG format, was that I was having issues with the transparencies of GIF images especially when I had defined them with a drop shadow. I would get little white areas around the shadows which looked rubbish when placing them over coloured backgrounds etc. PNG promised to do away with these issues - and certainly within Opera and FireFox it did. Unfortunately Microsoft in all it's wisdom had not implemented the PNG transparencies format properly and I was left with a grey/blue background behing all my PNG images.
A quick trawl via Google found me various solutions to fixing the issue under Internet Explorer, and the code snippet below was the most elegant I found. Elegant in the fact that if you are not running IE, your browser will completely ignore this code snippet; <!--[if gte IE 5.5000]>
<script language="JavaScript">
function correctPNG()
{
for(var i=0; i<document.images.length; i++)
{
var img = document.images[i]
var imgName = img.src.toUpperCase()
if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
{
var imgID = (img.id) ? "id='" + img.id + "' " : ""
var imgClass = (img.className) ? "class='" + img.className + "' " : ""
var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
var imgStyle = "display:inline-block;" + img.style.cssText
if (img.align == "left") imgStyle = "float:left;" + imgStyle
if (img.align == "right") imgStyle = "float:right;" + imgStyle
if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
var strNewHTML = "<span " + imgID + imgClass + imgTitle
+ " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;"
+ imgStyle + ";" + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
+ "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"
img.outerHTML = strNewHTML
i = i-1
}
}
}
window.attachEvent("onload", correctPNG);
</script>
<![endif]-->
Place the above code in the <head> ... </head> area of your templates index.php, and your blue/grey PNG backgrounds will disappear! There is a slight delay between loading the page and the PNG transparencies displaying properly - but nothing dramatic. All we need now is for Microsoft to pull a certain digit out of a certain orifice and code according to standards, and the above will become defunct... until then ;-) |
