/* Site-wide javascript */

// Universal transparent-PNG enabler for MSIE/Win 5.5+
// http://dsandler.org
// From original code: http://www.youngpup.net/?request=/snippets/sleight.xml
// and background-image code: http://www.allinthehead.com/retro/69
// also:
//  * use sizingMethod=crop to avoid scaling PNGs (who would do such a thing?)
//  * only do this once, to make it compatible with CSS rollovers

// Run this as the page loads
if (navigator.platform == "Win32" &&
    navigator.appName == "Microsoft Internet Explorer" && window.attachEvent) {
  // Do it right now, and schedule it for onload too
  enableAlphaImages();
  window.attachEvent("onload", enableAlphaImages);
}

function enableAlphaImages(){
  var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
  var itsAllGood = (rslt != null && Number(rslt[1]) >= 5.5);
  if (itsAllGood) {
    for (var i=0; i<document.all.length; i++){
      var obj = document.all[i];
      var bg = obj.currentStyle.backgroundImage;
      var img = document.images[i];
      if (bg && bg.match(/\.png/i) != null) {
	var img = bg.substring(5,bg.length-2);
	var offset = obj.style["background-position"];
	obj.style.filter =
	  "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+img+"', sizingMethod='scale')";
	// (Mac) Scale backgrounds instead of cropping
	obj.style.backgroundImage = "url('images/1px.gif')";
	obj.style["background-position"] = offset; // reapply
      } else if (img && img.src.match(/\.png$/i) != null) {
	var src = escape(img.src).replace("http%3A//","http://");
	img.style.width = img.width + "px";
	img.style.height = img.height + "px";
	img.style.filter =
	  "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+src+"', sizingMethod='crop')";
	img.src = "images/1px.gif";
      }
    }
  }
}