html/include/png.js

   1 if (navigator.platform == "Win32" && navigator.appName == "Microsoft Internet Explorer" && window.attachEvent)\r
   2         window.attachEvent("onload", pngLoadPngs);\r
   3 \r
   4 // parses all images //public\r
   5 function pngLoadPngs()\r
   6 {\r
   7         var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');\r
   8         var itsAllGood = (rslt != null && Number(rslt[1]) > 5.5);\r
   9 \r
  10         if (itsAllGood)\r
  11                 for (var i = 0; i < document.images.length; i++)\r
  12                         pngLoad(document.images[i]);\r
  13 }\r
  14 \r
  15 // loads an image, src is optional // public\r
  16 function pngLoad(img,src)\r
  17 {\r
  18         if (typeof img == "object" && typeof img.tagName == "string" && img.tagName == "IMG")\r
  19         {\r
  20                 // this is an image\r
  21                 if (typeof src == "string")\r
  22                 {\r
  23                         // src parameter is present\r
  24                         if (src.match(/\.png$/i) != null)\r
  25                         {\r
  26                                 // this is png image\r
  27                                 img.style.width = null;\r
  28                                 img.style.height = null;\r
  29                                 img.style.filter = null;\r
  30                                 img.src = src;\r
  31                                 pngSwapPrepare(img);\r
  32                         }\r
  33                         else\r
  34                         {\r
  35                                 // its not a png\r
  36                                 img.src = src;\r
  37                         }\r
  38                 }\r
  39                 else if (img.src.match(/\.png$/i) != null)\r
  40                 {\r
  41                                 // no src arameter, but its png -> simply swap\r
  42                                 pngSwapPrepare(img);\r
  43                 }\r
  44         }\r
  45 \r
  46         // swap (if complete) or shedule it to onload event // private\r
  47         function pngSwapPrepare(img)\r
  48         {\r
  49                 if (img.complete)\r
  50                         pngSwap(img);\r
  51                 else\r
  52                         img.attachEvent("onload",pngOnLoadSwap);\r
  53         }\r
  54         \r
  55         // supposed to be called when image is loaded into memory //private\r
  56         function pngOnLoadSwap()\r
  57         {\r
  58                 event.srcElement.detachEvent("onload",pngOnLoadSwap);\r
  59                 pngSwap(event.srcElement)\r
  60         }\r
  61 \r
  62         // Swaps img and background //private\r
  63         function pngSwap(img)\r
  64         {\r
  65                 with (img)\r
  66                 {\r
  67                         style.width = width + "px";\r
  68                         style.height = height + "px";\r
  69                         style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale') "\r
  70                         src = "images/null.gif";\r
  71                 }\r
  72         }\r
  73 }\r