var navs = new Array();
var navs_over = new Array();
	
function swapin(num) {
	document.getElementById('nav' + num).src = navs_over[num % 4].src;
}

function swapout(num) {
	document.getElementById('nav' + num).src = navs[num % 4].src;
}


function checksize(navid) {
	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"
		}
	]

	};
	BrowserDetect.init();
	var useJShack = (BrowserDetect.browser == "Explorer" && BrowserDetect.version == 6);
	//walk the DOM for subitems of the 'nav_cats' ul
	//don't change the root categories, only their children ul
	var rootitems = document.getElementById(navid).childNodes;
	var i;
	for (i = 0; i < rootitems.length; i++)
	{
		var thisnode = rootitems[i];
		if (useJShack)
		{
			if (thisnode.nodeName == "LI")
			{
				thisnode.onmouseover = function () {
					this.className += " over";
				}
				thisnode.onmouseout = function() {
					this.className = this.className.replace(" over","");
				}
			}
		}
		//expand ul's temporarily to get offsetHeight
		var ulitems = rootitems[i].getElementsByTagName('ul');
		for (j = 0; j < ulitems.length; j++)
		{
			ulitems[j].style.display = 'block';
		}
		
		var catitems = rootitems[i].getElementsByTagName('li');
		var j;
		var linode;
		for (j = 0; j < catitems.length; j++)
		{
			linode = catitems[j];
			//get offsetHeight of the child <a> link to see how tall it is (20 = line-height, use 25 for leeway)
			if (linode.childNodes[0].offsetHeight > 25)
			{
				linode.className = linode.className.replace("double",""); //don't want it there twice..
				linode.className += " double";
				if (useJShack)
				{
					linode.onmouseover = function() {
						this.style.background = "#ffffff url(skin1/images/navback2.gif) repeat-x";
					}
					linode.onmouseout = function() {
						this.style.background = "#ffffff";
					}
				}
			}
			else
			{
				linode.className = linode.className.replace("double","");
				if (useJShack)
				{
					linode.onmouseover = function() {
						this.style.background = "#ffffff url(skin1/images/navback.gif) repeat-x";
					}
					linode.onmouseout = function() {
						this.style.background = "#ffffff";
					}
				}
			}
		}
		
		var ulitems = rootitems[i].getElementsByTagName('ul');
		for (j = 0; j < ulitems.length; j++)
		{
			ulitems[j].style.display = '';
		}
	}
}


function initnav()
{
	navs[0] = new Image();
	navs[0].src = "skin1/images/prev2.gif";
	navs_over[0] = new Image();
	navs_over[0].src = "skin1/images/prev2_over.gif";
	
	navs[1] = new Image();
	navs[1].src = "skin1/images/prev.gif";
	navs_over[1] = new Image();
	navs_over[1].src = "skin1/images/prev_over.gif";
	
	navs[2] = new Image();
	navs[2].src = "skin1/images/next.gif";
	navs_over[2] = new Image();
	navs_over[2].src = "skin1/images/next_over.gif";
	
	navs[3] = new Image();
	navs[3].src = "skin1/images/next2.gif";
	navs_over[3] = new Image();
	navs_over[3].src = "skin1/images/next2_over.gif";

	checksize('nav_cats');
	checksize('nav_brands');
	checkCount();
}