//Array containing all PNG images on the page
var PNGimageArray = new Array();
var isPrinting = false;

//Path to the blank image (1x1 transparent)
var blankSrc = "images/blank.gif";

//Captures print events
window.attachEvent("onbeforeprint", function () { beforePrint(); } );
window.attachEvent("onafterprint", function () { afterPrint(); } );                               
                                                      
//Tests if element is a PNG image, and if so fixes it
function addPngImage(element){
	if (/\.png$/i.test(element.src)) {
		fixImage(element);
		element.attachEvent("onpropertychange", function () { propertyChanged(); } );
		PNGimageArray[PNGimageArray.length] = element;
	}
}

//Applies filter and changes source to blank
function fixImage(element) {
	element.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + element.src + "')";
	element.src = blankSrc;
}

//If property "src" is changed fixs image (not if it is changed to blank though)
function propertyChanged() {
	if (isPrinting) return;
	var element = event.srcElement;
	var pName = event.propertyName;
	if (pName != "src") return;
	if (!new RegExp(blankSrc).test(element.src))
		fixImage(element);

}

//Turns image back to original before print (Explorer can't print filters)
function beforePrint() {
	isPrinting = true;
	var element;
	for(var i = 0; i < PNGimageArray.length; i++){
		element = PNGimageArray[i];
		element.src = element.filters[0].src;
		element.runtimeStyle.filter = "";
	}

}

//Fixes image after print
function afterPrint() {
	isPrinting = false;
	var element;
	for(var i = 0; i < PNGimageArray.length; i++){
		element = PNGimageArray[i];
		fixImage(element);

	}
}