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

//Path to the blank image (1x1 transparent)
//var blankSrc = "img/11.gif";

//Captures print events
if (window.attachEvent)
{
	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) {
	var sizing = "";
	if (element.className.indexOf("pngscale") >= 0)
		sizing = ",sizingMethod='scale'";

  element.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, src='" + element.src + "'"+ sizing+")";
  element.style.width = element.offsetWidth + "px";
  element.style.height = element.offsetHeight + "px";
  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);

  }
}