//determines browser versions
bV = parseInt(navigator.appVersion);
ns4 = (document.layers);
ie4 = (document.all && !document.getElementById);
ie5 = (document.all && document.getElementById);
ns6 = (!document.all && document.getElementById);
opera = navigator.userAgent.indexOf("Opera") > -1;

// simple string mathcing for what browser is currently being used
// handy for unique id in css call for caching

// set a variable for css identification
if (ns4) {browser = 'ns4';}
else if (ie4) {browser = 'ie4';}
else if (ie5) {browser = 'ie5';}
else if (ns6) {browser = 'ns6';}
else if (opera) {browser = 'opera';}
browser = browser + navigator.platform;

/*
hide or unhide an element
takes input of the id of the element (usually a div) to be hidden or made to appear
and the state (optional) that it is made to be brought into
0 = hide, 1 = show, 2 = flip current state
if state is not specified then the default is flip (2)
*/
function hideElement() {
	var  el = arguments[0];
	var state;
	if (arguments.length == 1) state = 2;
	else if (arguments.length > 1) state = arguments[1];
	if (ie4) {
		if (state == 1) el.style.display = "block";
		else if (state == 0) el.style.display ="none";
		else if (state == 2) {
			if (el.style.display == "none" || el.style.display == "") el.style.display = "block";
			else el.style.display ="none";
		}
	} else if (ns4) {
		whichEl = eval("document." + el);
		if (state == 1) whichEl.visibility = "show";
		else if (state == 0) whichEl.visibility = "hide";
		else if (state == 2) {
			if (whichEl.visibility == "hide") whichEl.visibility = "show";
			else whichEl.visibility = "hide";
		}
	} else {
		if (state == 1) document.getElementById(el).style.display = "block";
		else if (state == 0) document.getElementById(el).style.display = "none";
		else if (state == 2) {
			if (document.getElementById(el).style.display == "none" || document.getElementById(el).style.display == "") document.getElementById(el).style.display = "block";
			else document.getElementById(el).style.display = "none";
		}
	}
}

// change the class associated with an id
// takes the id and the new class name
function changeClass(id, newClass) {
	if (ie4) {
		id.className = newClass;
	} else if (ns4) {
		whichEl = eval("document." + id);
		whichEl.className = newClass;
	} else {
		document.getElementById(id).className = newClass;
	}
}

function swapImage (id, newImage) {
	if (ie4) {
		id.src = newImage;
	} else if (ns4) {
		whichEl = eval("document." + id);
		whichEl.src = newImage;
	} else {
		document.getElementById(id).src = newImage;
	}
}

// Macromedia image manipulation utilities
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
	var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
	if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function MM_swapImgRestore() { //v3.0
	var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
	var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
	var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
	if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

/*	Macromedia function to open a popup window
*
*	PARAMETERS
*		theURL   = The URL we are opening in the popup window
*		winName  = Unique DOM name to give to this window
*		features = Features desired in the popup window, as outlined below (separated by commas)
*	
*		FEATURE NAME	TYPE		DESCRIPTION
*		directories		boolean		Controls the standard browser directory buttons 
*		height			numeric		Specifies the height of the window in pixels 
*		location		boolean		Controls the Location entry field 
*		menubar			boolean		Controls the menu at the top of the window 
*		resizable		boolean		Controls the ability to resize the window 
*		scrollbars		boolean		Controls the horizontal and vertical scrollbars
*		status 			boolean		Controls the status bar at the bottom of the window 
*		toolbar			boolean		Controls the standard browser toolbar 
*		width			numeric		Specifies the width of the window in pixels 
*
*	EXAMPLE
*		<a href="javascript:MM_openBrWindow('mypage.html', 'myPopupWindow', 'location=yes,menubar=yes,width=500,height=400')">...</a>
*/
function MM_openBrWindow(theURL,winName,features) { //v2.0
	window.open(theURL,winName,features);
}

// Cookie functions
function getexpirydate(nodays) {
	var UTCstring;
	Today = new Date();
	nomilli=Date.parse(Today);
	Today.setTime(nomilli+nodays*24*60*60*1000);
	UTCstring = Today.toUTCString();
	return UTCstring;
}

function getcookie(cookiename) {
	var cookiestring=""+document.cookie;
	var index1=cookiestring.indexOf(cookiename);
	if (index1==-1 || cookiename=="") return "";
	var index2=cookiestring.indexOf(';',index1);
	if (index2==-1) index2=cookiestring.length;
	return unescape(cookiestring.substring(index1+cookiename.length+1,index2));
}

function setexpiringcookie(name,value,domain,expires) {
	var expire = new Date();
	expire.setTime(expire.getTime() + 60000 * expires);
	cookiestring=name+"="+escape(value)+";domain="+escape(domain)+";expires="+expire.toGMTString() + ";path=/"; 
	document.cookie=cookiestring;
	if(!getcookie(name)){
		return false;
	} else {
		return true;
	}
}

function setcookie(name,value,domain) {
	cookiestring=name+"="+escape(value)+";domain="+escape(domain)+";path=/";
	document.cookie=cookiestring;
	if(!getcookie(name)){
		return false;
	} else{
		return true;
	}
}

// Location/host functions
function getHost() {
    hostname = new String(document.location);
    return cleanName(hostname);
}
			
function cleanName(hostname) {    
    var index = hostname.indexOf('http://');
    if(index != -1) {
		hostname = hostname.substring(7,hostname.length);
    } else {
		index = hostname.indexOf('https://');
		if(index != -1) {
		    hostname = hostname.substring(8,hostname.length);
		}
	}
	index = hostname.indexOf('/');
	if(index != -1) {
		hostname = hostname.substring(0,index);
	}			    
	    index = hostname.indexOf(':');
	if(index != -1) {
		hostname = hostname.substring(0,index);
	}
	return hostname;
}

function getReferrer() {
	return cleanName(document.referrer);
}

/*
* This function parses comma separated name=value 
* argument pairs from the query string of the URL. 
* It stores the name=value pairs in 
* properties of an object and then returns that object
* 
* Jim K - From Orielly JSB pp 244
*/
function getArgs() {
    var args = new Object();
    // Get Query String
    var query = location.search.substring(1); 
    // Split query at the comma
    var pairs = query.split("&"); 
    // Begin loop through the querystring
    for(var i = 0; i < pairs.length; i++) {
  	  // Look for "name=value"
  	  var pos = pairs[i].indexOf('='); 
  	  // if not found, skip to next
  	  if (pos == -1) continue; 
  	  // Extract the name
  	  var argname = pairs[i].substring(0,pos); 
  	  // Extract the value
  	  var value = pairs[i].substring(pos+1); 
  	  // Store as a property
  	  args[argname] = unescape(value); 
    }
    return args; // Return the Object
}

// restrict the number of characters allowed in a textarea
function maxlength_js(obj,maxlength) {
	//For Netscape 6 (not NS7) we have to disable this
    if (navigator.userAgent.indexOf('Netscape6') != -1) {
		return;
	}
    if (obj.value.length >= maxlength) {
		obj.value = obj.value.slice(0,maxlength);
    }
}