--Do not remove this if you are using--
Original Author: Remiz Rahnas
Original Author URL: http://www.htmlremix.com
Published date: 2008/09/24

Changes by Nick Fetchak:
- IE8 standards mode compatibility
- VML elements now positioned behind original box rather than inside of it - should be less prone to breakage
- Added partial support for 'box-shadow' style
- Checks for VML support before doing anything
- Updates VML element size and position via timer and also via window resize event
Published date : 2009/11/19
http://fetchak.com/ie-css3


<public:attach event="oncontentready" onevent="oncontentready('v08vnSVo78t4JfjH')" />
<script type="text/javascript">

timer_length = 200; // Milliseconds

// supportsVml() borrowed from http://stackoverflow.com/questions/654112/how-do-you-detect-support-for-vml-or-svg-in-a-browser
function supportsVml() {
	if (typeof supportsVml.supported == "undefined") {
		var a = document.body.appendChild(document.createElement('div'));
		a.innerHTML = '<v:shape id="vml_flag1" adj="1" />';
		var b = a.firstChild;
		b.style.behavior = "url(#default#VML)";
		supportsVml.supported = b ? typeof b.adj == "object": true;
		a.parentNode.removeChild(a);
	}
	return supportsVml.supported
}


// findPos() borrowed from http://www.quirksmode.org/js/findpos.html
function findPos(obj) {
	var curleft = curtop = 0;

	if (obj.offsetParent) {
		do {
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
		} while (obj = obj.offsetParent);
	}

	return({
		'x': curleft,
		'y': curtop
	});
}

function createShadow(element, vml_parent) {
	var style = element.currentStyle['-moz-box-shadow'] || element.currentStyle['-webkit-box-shadow'] || element.currentStyle['box-shadow'] || '';
	var match = style.match(/^(\d+)px (\d+)px (\d+)px/);
	if (!match) { return(false); }


	var shadow = document.createElement('v:roundrect');
	shadow.userAttrs = {
		'x': parseInt(RegExp.$1 || 0),
		'y': parseInt(RegExp.$2 || 0),
		'radius': parseInt(RegExp.$3 || 0) / 2
	};
	shadow.position_offset = {
		'y': vml_parent.pos_ieCSS3.y - shadow.userAttrs.radius - shadow.userAttrs.y - strokeWeight*0.55,
		'x': vml_parent.pos_ieCSS3.x - shadow.userAttrs.radius - shadow.userAttrs.x - strokeWeight*0.55
	};
	shadow.size_offset = {
		'width': element.strokeWeight,
		'height': element.strokeWeight
	};
	shadow.arcsize = element.arcSize +'px';
	shadow.style.display = 'block';
	shadow.style.position = 'absolute';
	shadow.style.top = (element.pos_ieCSS3.y + shadow.position_offset.y) +'px';
	shadow.style.left = (element.pos_ieCSS3.x + shadow.position_offset.x) +'px';
	shadow.style.width = (element.offsetWidth + shadow.size_offset.width*2) +'px';
	shadow.style.height = (element.offsetHeight + shadow.size_offset.height*2) +'px';
	shadow.style.antialias = true;
	shadow.className = 'vml_box_shadow';
	shadow.style.zIndex = element.zIndex - 1;
	shadow.style.filter = 'progid:DXImageTransform.Microsoft.Blur(pixelRadius='+ shadow.userAttrs.radius +',makeShadow=true,shadowOpacity=0.75)';

	element.parentNode.appendChild(shadow);
	//element.parentNode.insertBefore(shadow, element.element);

	// For window resizing
	element.vml.push(shadow);

	return(true);
}

function createBorderRect(element, vml_parent) {
	if (isNaN(element.borderRadius)) { return(false); }

	element.style.background = 'transparent';
	element.style.borderColor = 'transparent';

	var rect = document.createElement('v:roundrect');
	rect.position_offset = {
		'y': vml_parent.pos_ieCSS3.y + (0.5 * element.strokeWeight),
		'x': vml_parent.pos_ieCSS3.x + (0.5 * element.strokeWeight)
	};
	
	rect.size_offset = {				
		'width': -element.strokeWeight,
		'height': -element.strokeWeight
	};
	rect.arcsize = element.arcSize +'px';
	rect.strokecolor = element.strokeColor;
	rect.strokeWeight = element.strokeWeight +'px';
	rect.stroked = element.stroked;
	rect.className = 'vml_border_radius';
	rect.style.display = 'block';
	rect.style.position = 'absolute';
	rect.style.top = (element.pos_ieCSS3.y + rect.position_offset.y) +'px';
	rect.style.left = (element.pos_ieCSS3.x + rect.position_offset.x) +'px';
	rect.style.width = (element.offsetWidth) +'px';
	rect.style.height = (element.offsetHeight) +'px';
	rect.style.antialias = true;
	rect.style.zIndex = element.zIndex - 1;

	var fill = document.createElement('v:fill');
	fill.color = element.fillColor;
	fill.src = element.fillSrc;
	fill.className = 'vml_border_radius_fill';
	fill.type = 'tile';

	// Hack: IE6 doesn't support transparent borders, use padding to offset original element
	isIE6 = /msie|MSIE 6/.test(navigator.userAgent);
	if (isIE6 && (element.strokeWeight > 0)) {
		this.style.borderStyle = 'none';
		this.style.paddingTop = parseInt(this.currentStyle.paddingTop || 0) + element.strokeWeight;
		this.style.paddingBottom = parseInt(this.currentStyle.paddingBottom || 0) + element.strokeWeight;
		this.style.paddingRight = parseInt(this.currentStyle.paddingRight || 0) + element.strokeWeight;
		this.style.paddingLeft = parseInt(this.currentStyle.paddingLeft || 0) + element.strokeWeight;
	}

	rect.appendChild(fill);
	element.parentNode.appendChild(rect);
	//element.parentNode.insertBefore(rect, element.element);

	// For window resizing
	element.vml.push(rect);

	return(true);
}

function oncontentready(classID) {
	// For IE9+, CSS3 does everything already so ignore the htc code
	if (!(document.body.style.BoxShadow === undefined && document.body.style.boxShadow === undefined)) {	
		return false;
	}
	if (!supportsVml()) { return(false); }

	if (this.className.match(classID)) { return(false); }
	this.className = this.className.concat(' ', classID);

	// Add a namespace for VML (IE8 requires it)
	if (!document.namespaces.v) { document.namespaces.add("v", "urn:schemas-microsoft-com:vml"); }

	// Check to see if we've run once before on this page
	if (typeof(window.ieCSS3) == 'undefined') {
		// Create global ieCSS3 object
		window.ieCSS3 = {
			'vmlified_elements': new Array(),
			'update_timer': setInterval(updatePositionAndSize, timer_length)
		};

		if (typeof(window.onresize) == 'function') { window.ieCSS3.previous_onresize = window.onresize; }

		// Attach window resize event
		window.onresize = updatePositionAndSize;
	}


	// These attrs are for the script and have no meaning to the browser:
	this.borderRadius = parseInt(this.currentStyle['-moz-border-radius'] ||
	                             this.currentStyle['-webkit-border-radius'] ||
	                             this.currentStyle['border-radius'] ||
	                             this.currentStyle['-khtml-border-radius']);
	this.arcSize = Math.min(this.borderRadius / Math.min(this.offsetWidth, this.offsetHeight), 1);
	this.fillColor = this.currentStyle.backgroundColor;
	this.fillSrc = this.currentStyle.backgroundImage.replace(/^url\("(.+)"\)$/, '$1');
	this.strokeColor = this.currentStyle.borderColor;
	this.strokeWeight = parseInt(this.currentStyle.borderWidth);
	this.stroked = 'true';
	if (isNaN(this.strokeWeight)) {
		this.strokeWeight = 0;
		this.strokeColor = this.fillColor;
		this.stroked = 'false';
	}

	this.element.vml = new Array();
	this.zIndex = parseInt(this.currentStyle.zIndex);
	if (isNaN(this.zIndex)) { this.zIndex = 0; }

	// Find which element provides position:relative for the target element (default to BODY)
	vml_parent = this;
	var limit = 100, i = 0;
	do {
		vml_parent = vml_parent.parentElement;
		i++;
		if (i >= limit) { return(false); }
	} while ((typeof(vml_parent) != 'undefined') && (vml_parent.currentStyle.position != 'relative') && (vml_parent.tagName != 'BODY'));

	vml_parent.pos_ieCSS3 = findPos(vml_parent);
	this.pos_ieCSS3 = findPos(this);

	var rv1 = createShadow(this, vml_parent);
	var rv2 = createBorderRect(this, vml_parent);

	if (rv1 || rv2) { window.ieCSS3.vmlified_elements.push(this.element); }

	if (typeof(vml_parent.document.ieCSS3_stylesheet) == 'undefined') {
		vml_parent.document.ieCSS3_stylesheet = vml_parent.document.createStyleSheet();
		vml_parent.document.ieCSS3_stylesheet.addRule("v\\:roundrect", "behavior: url(#default#VML)");
		vml_parent.document.ieCSS3_stylesheet.addRule("v\\:fill", "behavior: url(#default#VML)");
	}
}

function updatePositionAndSize() {
	if (typeof(window.ieCSS3.vmlified_elements) != 'object') { return(false); }

	for (var i in window.ieCSS3.vmlified_elements) {
		var el = window.ieCSS3.vmlified_elements[i];

		if (typeof(el.vml) != 'object') { continue; }

		for (var z in el.vml) {
			//var parent_pos = findPos(el.vml[z].parentNode);
			var new_pos = findPos(el);
			new_pos.x = (new_pos.x + el.vml[z].position_offset.x) + 'px';
			new_pos.y = (new_pos.y + el.vml[z].position_offset.y) + 'px';
			if (el.vml[z].style.left != new_pos.x) { el.vml[z].style.left = new_pos.x; }
			if (el.vml[z].style.top != new_pos.y) { el.vml[z].style.top = new_pos.y; }

			var new_size = {
				'width': parseInt(el.offsetWidth + el.vml[z].size_offset.width)>0?parseInt(el.offsetWidth + el.vml[z].size_offset.width):0,
				'height': parseInt(el.offsetHeight + el.vml[z].size_offset.height)>0?parseInt(el.offsetHeight + el.vml[z].size_offset.height):0
			}
			if (el.vml[z].offsetWidth != new_size.width) { el.vml[z].style.width = new_size.width +'px'; }
			if (el.vml[z].offsetHeight != new_size.height) { el.vml[z].style.height = new_size.height +'px'; }
		}
	}

	if (event && (event.type == 'resize') && typeof(window.ieCSS3.previous_onresize) == 'function') { window.ieCSS3.previous_onresize(); }
}
</script>