var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]
};


// from: http://www.netlobo.com/div_hiding.html
function toggleLayer(whichLayer) {
    if (document.getElementById) {
        // this is the way the standards work
        var elem = document.getElementById(whichLayer);
        elem.style.display = "block";
    } else if (document.all) {
        // this is the way old msie versions work
        var elem = document.all[whichLayer];
        elem.style.display = "block";
    } else if (document.layers) {
        // this is the way nn4 works
        var elem = document.layers[whichLayer];
        elem.style.display = "block";
    }

	return true;
}

function init() {
	BrowserDetect.init();

	if ((BrowserDetect.browser == "Explorer" && BrowserDetect.version >= 7) ||
	    (BrowserDetect.browser == "Firefox" && BrowserDetect.version >= 1) ||
	    (BrowserDetect.browser == "Opera") ||
	    (BrowserDetect.browser == "Safari") ||
	    (BrowserDetect.browser == "Konqueror") ||
	    (BrowserDetect.browser == "Netscape" && BrowserDetect.version >= 6)) {
		// new(-ish) browser. Should support CSS positioning correctly.
		toggleLayer('pBoxLeft');
		toggleLayer('pBoxLeft');
		toggleLayer('pBoxRight');
	}
}


/*
 * Make Mozilla fire the initAll event immediately after the content is read.
 * This window.onload only fires after everything (including images) are loaded.
 */
if (document.addEventListener) {
    document.addEventListener("DOMContentLoaded", initAll, false);
}

window.onload=init;