/*******************
  Browser Detection
********************/

// Browser Detect Lite  v2.1.4
// http://www.dithered.com/javascript/browser_detect/index.html
// modified by Chris Nott (chris@NOSPAMdithered.com - remove NOSPAM)


function BrowserDetectLite() {
   var ua = navigator.userAgent.toLowerCase();

   // browser name
   this.isGecko     = (ua.indexOf('gecko') != -1 && ua.indexOf('safari') == -1);
   this.isMozilla   = (this.isGecko && ua.indexOf('gecko/') + 14 == ua.length);
   this.isNS        = ( (this.isGecko) ? (ua.indexOf('netscape') != -1) : ( (ua.indexOf('mozilla') != -1) && (ua.indexOf('spoofer') == -1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('opera') == -1) && (ua.indexOf('webtv') == -1) && (ua.indexOf('hotjava') == -1) ) );
   this.isIE        = ( (ua.indexOf('msie') != -1) && (ua.indexOf('opera') == -1) && (ua.indexOf('webtv') == -1) );
   this.isSafari    = (ua.indexOf('safari') != - 1);
   this.isOpera     = (ua.indexOf('opera') != -1);
   this.isKonqueror = (ua.indexOf('konqueror') != -1 && !this.isSafari);
   this.isIcab      = (ua.indexOf('icab') != -1);
   this.isAol       = (ua.indexOf('aol') != -1);

   // spoofing and compatible browsers
   this.isIECompatible = ( (ua.indexOf('msie') != -1) && !this.isIE);
   this.isNSCompatible = ( (ua.indexOf('mozilla') != -1) && !this.isNS && !this.isMozilla);

   // browser version
   this.versionMinor = parseFloat(navigator.appVersion);

   // correct version number
   if (this.isNS && this.isGecko) {
      this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('/') + 1 ) );
   }
   else if (this.isIE && this.versionMinor >= 4) {
      this.versionMinor = parseFloat( ua.substring( ua.indexOf('msie ') + 5 ) );
   }
   else if (this.isMozilla) {
      this.versionMinor = parseFloat( ua.substring( ua.indexOf('rv:') + 3 ) );
   }
   else if (this.isSafari) {
      this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('/') + 1 ) );
   }
   else if (this.isOpera) {
      if (ua.indexOf('opera/') != -1) {
         this.versionMinor = parseFloat( ua.substring( ua.indexOf('opera/') + 6 ) );
      }
      else {
         this.versionMinor = parseFloat( ua.substring( ua.indexOf('opera ') + 6 ) );
      }
   }
   else if (this.isKonqueror) {
      this.versionMinor = parseFloat( ua.substring( ua.indexOf('konqueror/') + 10 ) );
   }
   else if (this.isIcab) {
      if (ua.indexOf('icab/') != -1) {
         this.versionMinor = parseFloat( ua.substring( ua.indexOf('icab/') + 6 ) );
      }
      else {
         this.versionMinor = parseFloat( ua.substring( ua.indexOf('icab ') + 6 ) );
      }
   }

   this.versionMajor = parseInt(this.versionMinor);
   this.geckoVersion = ( (this.isGecko) ? ua.substring( (ua.lastIndexOf('gecko/') + 6), (ua.lastIndexOf('gecko/') + 14) ) : -1 );

   // dom support
   this.isDOM1 = (document.getElementById);
   this.isDOM2Event = (document.addEventListener && document.removeEventListener);

   // css compatibility mode
   this.mode = document.compatMode ? document.compatMode : 'BackCompat';

   // platform
   this.isWin   = (ua.indexOf('win') != -1);
   this.isWin32 = (this.isWin && ( ua.indexOf('95') != -1 || ua.indexOf('98') != -1 || ua.indexOf('nt') != -1 || ua.indexOf('win32') != -1 || ua.indexOf('32bit') != -1 || ua.indexOf('xp') != -1) );
   this.isMac   = (ua.indexOf('mac') != -1);
   this.isUnix  = (ua.indexOf('unix') != -1 || ua.indexOf('sunos') != -1 || ua.indexOf('bsd') != -1 || ua.indexOf('x11') != -1)
   this.isLinux = (ua.indexOf('linux') != -1);

   // specific browser shortcuts
   this.isNS4x = (this.isNS && this.versionMajor == 4);
   this.isNS40x = (this.isNS4x && this.versionMinor < 4.5);
   this.isNS47x = (this.isNS4x && this.versionMinor >= 4.7);
   this.isNS4up = (this.isNS && this.versionMinor >= 4);
   this.isNS6x = (this.isNS && this.versionMajor == 6);
   this.isNS6up = (this.isNS && this.versionMajor >= 6);
   this.isNS7x = (this.isNS && this.versionMajor == 7);
   this.isNS7up = (this.isNS && this.versionMajor >= 7);

   this.isIE4x = (this.isIE && this.versionMajor == 4);
   this.isIE4up = (this.isIE && this.versionMajor >= 4);
   this.isIE5x = (this.isIE && this.versionMajor == 5);
   this.isIE55 = (this.isIE && this.versionMinor == 5.5);
   this.isIE5up = (this.isIE && this.versionMajor >= 5);
   this.isIE6x = (this.isIE && this.versionMajor == 6);
   this.isIE6up = (this.isIE && this.versionMajor >= 6);

   this.isIE4xMac = (this.isIE4x && this.isMac);
}
var browser = new BrowserDetectLite();

// browser detection variables
// uses dithered.com browserdetect_lite script
// http://www.dithered.com/javascript/browser_detect/index.html
var isIE55Up = (browser.isWin && browser.isIE && browser.versionMinor >= 5.5);
var isIE55Down = (browser.isWin && browser.isIE && browser.versionMinor < 5.5);
var spacerGif = '../images/gui/spacer.gif';

// recurse through linked and imported stylesheets
function fixPngBackgrounds() {
	if (isIE55Up) {
		walkStyleRules(applyAlphaLoader);
	}
	else if (isIE55Down) {
		walkStyleRules(substituteGif);
	}
}

function applyAlphaLoader(rule) {
	var sBgImage = rule.style.backgroundImage; // url(/path/to/image)
   //alert(sBgImage);
	if (sBgImage) {
		var imgSrc = sBgImage.substring(4,rule.style.backgroundImage.length-1);
	//	alert(imgSrc);
		if ( imgSrc.match(/\.png$/i) ) {
			rule.style.backgroundImage = 'none';
			//imgSrc = imgSrc.substring(3,imgSrc.length);
			rule.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + imgSrc + "')";
			//alert(imgSrc);
		
		}
	}
}

function substituteGif(rule) {
	var sBgImage = rule.style.backgroundImage; // url(/path/to/image)
	if (sBgImage) {
		var imgSrc = sBgImage.substring(4,rule.style.backgroundImage.length-1);
		if ( imgSrc.match(/\.png$/i) ) {
			rule.style.backgroundImage = 'url(' + imgSrc.replace(/(.+)\.png$/i, "$1.gif") + ')';
		}
	}
}

// modified version of youngpup.net's "sleight" code snippet
function fixPngImages() {
	if (browser.isIE && browser.isWin && window.attachEvent) {
		window.attachEvent("onload", fnLoadPngs);
	}
}

// call onload
function fnLoadPngs() {
	for (var i = document.images.length - 1, img = null; (img = document.images[i]); i--) {
		if (isIE55Up && img.src.match(/\.png$/i) != null) {
			var src = img.src;
			img.style.width = img.width + "px";
			img.style.height = img.height + "px";
			img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')";
			img.src = spacerGif;
		}
	}
}

// recurse through linked and imported stylesheets, applying fn to each rule
function walkStyleRules(fn) {
	var sCol = (walkStyleRules.arguments[1]) ? walkStyleRules.arguments[1] : document.styleSheets;
	for (var i = 0; i < sCol.length; i++) {
		for (var j = 0; j < sCol[i].rules.length; j++) {
   fn(sCol[i].rules[j]);
		}
		if (sCol[i].imports.length > 0) {
			walkStyleRules(fn, sCol[i].imports);
		}
	}
}

fixPngBackgrounds();
fixPngImages();


/***********************************
  Cross Browser DOM Functions
************************************/

/* cross-browser DOM functions */

function xbGetElementById(id) {
	var elm = null
	if (document.getElementById) {
		elm = document.getElementById(id)
	}
	else if (document.all) {
		elm = (document.all[id]) ? document.all[id] : null
	}
	else if (document.layers) {
		elm = document.layers[id] // punting on full NS 4 support for now
	}
	return elm
}

function xbGetElementPageX(elm) {
	var x = 0
	if (typeof elm.offsetLeft == 'number') {
		while (elm) {
		  x += elm.offsetLeft
		  elm = elm.offsetParent
		}
	}
	else if (document.layers) {
		x = elm.pageX // won't work for image objects
	}
	return x
}

function xbGetElementPageY(elm) {
	var y = 0
	if (typeof elm.offsetTop == 'number') {
		while (elm) {
		  y += elm.offsetTop
		  elm = elm.offsetParent
		}
	}
	else if (document.layers) {
		y = elm.pageY // won't work for image objects
	}
	return y
}

/* cross browser event listeners */

function xbAddEventListener(elm, evType, fn, useCapture) {
	if (elm.addEventListener) { // DOM
		elm.addEventListener(evType, fn, useCapture)
	}
	else if (elm.attachEvent) { // MSIE
		elm.attachEvent('on' + evType, fn)
	}
	else { // emulation
		if (typeof elm['_eventListeners'] == 'undefined') {
			elm['_eventListeners'] = {}
		}
		if (!elm['_eventListeners'][evType]) {
			elm['_eventListeners'][evType] = []
			curEvtHandler = elm['on' + evType]
			if (curEvtHandler) {
				elm['_eventListeners'][evType][0] = curEvtHandler // copy existing event handler
			}
			elm['on' + evType] = xbGenericEventHandler
		}
		elm['_eventListeners'][evType][elm['_eventListeners'][evType].length] = fn
	}
}

function xbGenericEventHandler(evt) {
	evt = (evt) ? evt : ((window.event) ? window.event : "")
	if (evt) {
		var ary = this['_eventListeners'][evt.type]
		for (var i = 0; i < ary.length; i++) {
			if (ary[i]) {
				ary[i]()
			}
		}
	}
}