IE浏览器中PNG图片背景透明

网页里的PNG图片

.div1 img{ position:absolute; top:-3px; left:-2px;behavior:url("iepngfix.htc");width:103px; height:125px;}

背景为PNG图片
.div2{ background:url(/images/button05.png) no-repeat; width:66px; height:21px; line-height:21px;font-size:12px; border:0; cursor:pointer;behavior:url("iepngfix.htc");}

将以下内容保存为iepngfix.htc:

<public:component>
<mce:script type="text/javascript"><!--
// IE5.5+ PNG Alpha Fix v2.0 Alpha
// (c) 2004-2008 Angus Turnbull http://www.twinhelix.com 
// This is licensed under the GNU LGPL, version 2.1 or later.
// For details, see: http://creativecommons.org/licenses/LGPL/2.1/ 
var IEPNGFix = window.IEPNGFix || {};
IEPNGFix.data = IEPNGFix.data || {};

// This must be a path to a blank image, relative to the HTML document(s).
// In production use I suggest '/images/blank.gif' or similar. That's all!
IEPNGFix.blankImg = '/Images/Imagesarticle/blank.gif';

IEPNGFix.fix = function(elm, src, t) {
// Applies an image 'src' to an element 'elm' using the DirectX filter.
// If 'src' is null, filter is disabled.
// Disables the 'hook' to prevent infinite recursion on setting BG/src.
// 't' = type, where background tile = 0, background = 1, IMG SRC = 2.

var h = this.hook.enabled;
this.hook.enabled = 0;

var f = 'DXImageTransform.Microsoft.AlphaImageLoader';
src = (src || '').replace(//(/g, '%28').replace(//)/g, '%29');

if (
src && !(/IMG|INPUT/.test(elm.nodeName) && (t != 2)) &&
elm.currentStyle.width == 'auto' && elm.currentStyle.height == 'auto'
) {
elm.style.width = elm.offsetWidth + 'px';
elm.style.height = elm.clientHeight + 'px';
if (elm.currentStyle.display == 'inline') {
elm.style.display = 'inline-block';
}
}

if (t == 1) {
elm.style.backgroundImage = 'url("' + this.blankImg + '")';
}
if (t == 2) {
elm.src = this.blankImg;
}

if (elm.filters[f]) {
elm.filters[f].enabled = src ? true : false;
if (src) {
elm.filters[f].src = src;
}
} else if (src) {
elm.style.filter = 'progid:' + f + '(src="' + src +
'",sizingMethod="' + (t == 2 ? 'scale' : 'crop') + '")';
}

this.hook.enabled = h;
};

IEPNGFix.process = function(elm, init) {
// Checks the onpropertychange event (on first 'init' run, a fake event)
// and calls the filter-applying-functions.

if (
!/MSIE (5/.5|6)/.test(navigator.userAgent) ||
typeof elm.filters == 'unknown'
) {
return;
}
if (!this.data[elm.uniqueID]) {
this.data[elm.uniqueID] = {
className: ''
};
}
var data = this.data[elm.uniqueID],
evt = init ? { propertyName: 'src,backgroundImage' } : event,
isSrc = /src/.test(evt.propertyName),
isBg = /backgroundImage/.test(evt.propertyName),
isPos = /width|height|background(Pos|Rep)/.test(evt.propertyName),
isClass = !init && ((elm.className != data.className) &&
(elm.className || data.className));
if (!(isSrc || isBg || isPos || isClass)) {
return;
}
data.className = elm.className;
var blank = this.blankImg.match(/([^//]+)$/)[1],
eS = elm.style,
eCS = elm.currentStyle;

// Required for Whatever:hover - erase set BG if className changes.
if (
isClass && (eS.backgroundImage.indexOf('url(') == -1 ||
eS.backgroundImage.indexOf(blank) > -1)
) {
return setTimeout(function() {
eS.backgroundImage = '';
}, 0);
}

// Foregrounds.
if (isSrc && elm.src &&  { IMG: 1, INPUT: 1 }[elm.nodeName]) {
if ((//.png/i).test(elm.src)) {
this.fix(elm, elm.src, 2);
} else if (elm.src.indexOf(blank) == -1) {
this.fix(elm, '');
}
}

// Backgrounds.
var bgSrc = eCS.backgroundImage || eS.backgroundImage;
if ((bgSrc + elm.src).indexOf(blank) == -1) {
var bgPNG = bgSrc.match(/url[("']+(.*/.png[^/)"']*)[/)"']/i);
if (bgPNG) {
if (this.tileBG && !{ IMG: 1, INPUT: 1 }[elm.nodeName]) {
this.tileBG(elm, bgPNG[1]);
this.fix(elm, '', 1);
} else {
if (data.tiles && data.tiles.src) {
this.tileBG(elm, '');
}
this.fix(elm, bgPNG[1], 1);
this.childFix(elm);
}
} else {
if (data.tiles && data.tiles.src) {
this.tileBG(elm, '');
}
this.fix(elm, '');
}
} else if ((isPos || isClass) && data.tiles && data.tiles.src) {
this.tileBG(elm, data.tiles.src);
}

if (init) {
this.hook.enabled = 1;
elm.attachEvent('onpropertychange', this.hook);
}
};

IEPNGFix.childFix = function(elm) {
// "hasLayout" fix for unclickable children inside PNG backgrounds.
var tags = [
'a',
'input',
'select',
'textarea',
'button',
'iframe',
'object'
],
t = tags.length,
tFix = [];
while (t--) {
var pFix = elm.all.tags(tags[t]),
e = pFix.length;
while (e--) {
tFix.push(pFix[e]);
}
}
t = tFix.length;
if (t && (/relative|absolute/i).test(elm.currentStyle.position)) {
alert('IEPNGFix: Unclickable children of element:' +
'/n/n<' + elm.nodeName + (elm.id && ' id=' + elm.id) + '>');
}
while (t--) {
if (!(/relative|absolute/i).test(tFix[t].currentStyle.position)) {
tFix[t].style.position = 'relative';
}
}
};

IEPNGFix.hook = function() {
if (IEPNGFix.hook.enabled) {
IEPNGFix.process(element, 0);
}
};

IEPNGFix.process(element, 1);
// --></mce:script>
</public:component>