//From CodeProject

var doIEalphaPNGfix = false;
if(jQuery && $.browser.msie && $.browser.version < 7.0) doIEalphaPNGfix = true;
if(!window.attachEvent) doIEalphaPNGfix = false;

$(function() {
if(doIEalphaPNGfix) {

//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/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;
  }
}

//Call the function for every image
for(var i = 0; i < document.images.length; i++) {
  //document.images[i].style.filter = "expression(addPngImage(this))";
  addPngImage(document.images[i]);
}



//Applies filter and changes source to blank

function fixImage(element) {
//TODO already set filters need to be appended
  element.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + element.src + "', sizingMethod='scale')";
  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);

  }
}


}
});