// IE5.5+ PNG Alpha Fix v2.0 Alpha: Background Tiling Support// (c) 2008-2009 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 = Math.max(0, xPos + pngW > elmW ? elmW - xPos : pngW),clipB = Math.max(0, yPos + pngH > elmH ? elmH - yPos : pngH);d = tiles.cache[count];s = d.style;s.behavior = 'none';s.left = (xPos - parseInt(elm.currentStyle.paddingLeft)) + '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);});}