// 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);
	});
}







// minmax.js: make IE5+/Win support CSS min/max-width/height
// version 1.0, 08-Aug-2003
// written by Andrew Clover <and@doxdesk.com>, use freely

/*@cc_on
@if (@_win32 && @_jscript_version>4)

var minmax_elements;

minmax_props= new Array(
  new Array('min-width', 'minWidth'),
  new Array('max-width', 'maxWidth'),
  new Array('min-height','minHeight'),
  new Array('max-height','maxHeight')
);

// Binding. Called on all new elements. If <body>, initialise; check all
// elements for minmax properties

function minmax_bind(el) {
  var i, em, ms;
  var st= el.style, cs= el.currentStyle;

  if (minmax_elements==window.undefined) {
    // initialise when body element has turned up, but only on IE
    if (!document.body || !document.body.currentStyle) return;
    minmax_elements= new Array();
    window.attachEvent('onresize', minmax_delayout);
    // make font size listener
    em= document.createElement('div');
    em.setAttribute('id', 'minmax_em');
    em.style.position= 'absolute'; em.style.visibility= 'hidden';
    em.style.fontSize= 'xx-large'; em.style.height= '5em';
    em.style.top='-5em'; em.style.left= '0';
    if (em.style.setExpression) {
      em.style.setExpression('width', 'minmax_checkFont()');
      document.body.insertBefore(em, document.body.firstChild);
    }
  }

  // transform hyphenated properties the browser has not caught to camelCase
  for (i= minmax_props.length; i-->0;)
    if (cs[minmax_props[i][0]])
      st[minmax_props[i][1]]= cs[minmax_props[i][0]];
  // add element with properties to list, store optimal size values
  for (i= minmax_props.length; i-->0;) {
    ms= cs[minmax_props[i][1]];
    if (ms && ms!='auto' && ms!='none' && ms!='0' && ms!='') {
      st.minmaxWidth= cs.width; st.minmaxHeight= cs.height;
      minmax_elements[minmax_elements.length]= el;
      // will need a layout later
      minmax_delayout();
      break;
  } }
}

// check for font size changes

var minmax_fontsize= 0;
function minmax_checkFont() {
  var fs= document.getElementById('minmax_em').offsetHeight;
  if (minmax_fontsize!=fs && minmax_fontsize!=0)
    minmax_delayout();
  minmax_fontsize= fs;
  return '5em';
}

// Layout. Called after window and font size-change. Go through elements we
// picked out earlier and set their size to the minimum, maximum and optimum,
// choosing whichever is appropriate

// Request re-layout at next available moment
var minmax_delaying= false;
function minmax_delayout() {
  if (minmax_delaying) return;
  minmax_delaying= true;
  window.setTimeout(minmax_layout, 0);
}

function minmax_stopdelaying() {
  minmax_delaying= false;
}

function minmax_layout() {
  window.setTimeout(minmax_stopdelaying, 100);
  var i, el, st, cs, optimal, inrange;
  for (i= minmax_elements.length; i-->0;) {
    el= minmax_elements[i]; st= el.style; cs= el.currentStyle;

    // horizontal size bounding
    st.width= st.minmaxWidth; optimal= el.offsetWidth;
    inrange= true;
    if (inrange && cs.minWidth && cs.minWidth!='0' && cs.minWidth!='auto' && cs.minWidth!='') {
      st.width= cs.minWidth;
      inrange= (el.offsetWidth<optimal);
    }
    if (inrange && cs.maxWidth && cs.maxWidth!='none' && cs.maxWidth!='auto' && cs.maxWidth!='') {
      st.width= cs.maxWidth;
      inrange= (el.offsetWidth>optimal);
    }
    if (inrange) st.width= st.minmaxWidth;

    // vertical size bounding
    st.height= st.minmaxHeight; optimal= el.offsetHeight;
    inrange= true;
    if (inrange && cs.minHeight && cs.minHeight!='0' && cs.minHeight!='auto' && cs.minHeight!='') {
      st.height= cs.minHeight;
      inrange= (el.offsetHeight<optimal);
    }
    if (inrange && cs.maxHeight && cs.maxHeight!='none' && cs.maxHeight!='auto' && cs.maxHeight!='') {
      st.height= cs.maxHeight;
      inrange= (el.offsetHeight>optimal);
    }
    if (inrange) st.height= st.minmaxHeight;
  }
}

// Scanning. Check document every so often until it has finished loading. Do
// nothing until <body> arrives, then call main init. Pass any new elements
// found on each scan to be bound   

var minmax_SCANDELAY= 500;

function minmax_scan() {
  var el;
  for (var i= 0; i<document.all.length; i++) {
    el= document.all[i];
    if (!el.minmax_bound) {
      el.minmax_bound= true;
      minmax_bind(el);
  } }
}

var minmax_scanner;
function minmax_stop() {
  window.clearInterval(minmax_scanner);
  minmax_scan();
}

minmax_scan();
minmax_scanner= window.setInterval(minmax_scan, minmax_SCANDELAY);
window.attachEvent('onload', minmax_stop);

@end @*/