// IE5.5+ PNG Alpha Fix v2.0 Alpha: Background Tiling Support // (c) 2008 Angus Turnbull http://www.twinhelix.com  // This is licensed under the GNU LGPL, version 2.1 or later. // For details, see: http://creativecommons.org/licenses/LGPL/2.1/  var IEPNGFix = window.IEPNGFix || {};  IEPNGFix.tileBG = function(elm, pngSrc, ready) {         // Params: A reference to a DOM element, the PNG src file pathname, and a         // hidden "ready-to-run" passed when called back after image preloading.          var data = this.data[elm.uniqueID],                 elmW = Math.max(elm.clientWidth, elm.scrollWidth),                 elmH = Math.max(elm.clientHeight, elm.scrollHeight),                 bgX = elm.currentStyle.backgroundPositionX,                 bgY = elm.currentStyle.backgroundPositionY,                 bgR = elm.currentStyle.backgroundRepeat;          // Cache of DIVs created per element, and image preloader/data.         if (!data.tiles) {                 data.tiles = {                         elm: elm,                         src: '',                         cache: [],                         img: new Image(),                         old: {}                 };         }         var tiles = data.tiles,                 pngW = tiles.img.width,                 pngH = tiles.img.height;          if (pngSrc) {                 if (!ready && pngSrc != tiles.src) {                         // New image? Preload it with a callback to detect dimensions.                         tiles.img.onload = function() {                                 this.onload = null;                                 IEPNGFix.tileBG(elm, pngSrc, 1);                         };                         return tiles.img.src = pngSrc;                 }         } else {                 // No image?                 if (tiles.src) ready = 1;                 pngW = pngH = 0;         }         tiles.src = pngSrc;          if (!ready && elmW == tiles.old.w && elmH == tiles.old.h &&                 bgX == tiles.old.x && bgY == tiles.old.y && bgR == tiles.old.r) {                 return;         }          // Convert English and percentage positions to pixels.         var pos = {                         top: '0%',                         left: '0%',                         center: '50%',                         bottom: '100%',                         right: '100%'                 },                 x,                 y,                 pc;         x = pos[bgX] || bgX;         y = pos[bgY] || bgY;         if (pc = x.match(/(\d+)%/)) {                 x = Math.round((elmW - pngW) * (parseInt(pc[1]) / 100));         }         if (pc = y.match(/(\d+)%/)) {                 y = Math.round((elmH - pngH) * (parseInt(pc[1]) / 100));         }         x = parseInt(x);         y = parseInt(y);          // Handle backgroundRepeat.         var repeatX = { 'repeat': 1, 'repeat-x': 1 }[bgR],                 repeatY = { 'repeat': 1, 'repeat-y': 1 }[bgR];         if (repeatX) {                 x %= pngW;                 if (x > 0) x -= pngW;         }         if (repeatY) {                 y %= pngH;                 if (y > 0) y -= pngH;         }          // Go!         this.hook.enabled = 0;         if (!({ relative: 1, absolute: 1 }[elm.currentStyle.position])) {                 elm.style.position = 'relative';         }         var count = 0,                 xPos,                 maxX = repeatX ? elmW : x + 0.1,                 yPos,                 maxY = repeatY ? elmH : y + 0.1,                 d,                 s,                 isNew;         if (pngW && pngH) {                 for (xPos = x; xPos < maxX; xPos += pngW) {                         for (yPos = y; yPos < maxY; yPos += pngH) {                                 isNew = 0;                                 if (!tiles.cache[count]) {                                         tiles.cache[count] = document.createElement('div');                                         isNew = 1;                                 }                                 var clipR = (xPos + pngW > elmW ? elmW - xPos : pngW),                                         clipB = (yPos + pngH > elmH ? elmH - yPos : pngH);                                 d = tiles.cache[count];                                 s = d.style;                                 s.behavior = 'none';                                 s.left = xPos + 'px';                                 s.top = yPos + 'px';                                 s.width = clipR + 'px';                                 s.height = clipB + 'px';                                 s.clip = 'rect(' +                                         (yPos < 0 ? 0 - yPos : 0) + 'px,' +                                         clipR + 'px,' +                                         clipB + 'px,' +                                         (xPos < 0 ? 0 - xPos : 0) + 'px)';                                 s.display = 'block';                                 if (isNew) {                                         s.position = 'absolute';                                         s.zIndex = -999;                                         if (elm.firstChild) {                                                 elm.insertBefore(d, elm.firstChild);                                         } else {                                                 elm.appendChild(d);                                         }                                 }                                 this.fix(d, pngSrc, 0);                                 count++;                         }                 }         }         while (count < tiles.cache.length) {                 this.fix(tiles.cache[count], '', 0);                 tiles.cache[count++].style.display = 'none';         }          this.hook.enabled = 1;          // Cache so updates are infrequent.         tiles.old = {                 w: elmW,                 h: elmH,                 x: bgX,                 y: bgY,                 r: bgR         }; };   IEPNGFix.update = function() {         // Update all PNG backgrounds.         for (var i in IEPNGFix.data) {                 var t = IEPNGFix.data[i].tiles;                 if (t && t.elm && t.src) {                         IEPNGFix.tileBG(t.elm, t.src);                 }         } }; IEPNGFix.update.timer = 0;  if (window.attachEvent && !window.opera) {         window.attachEvent('onresize', function() {                 clearTimeout(IEPNGFix.update.timer);                 IEPNGFix.update.timer = setTimeout(IEPNGFix.update, 100);         }); }