// The following functions were pulled from lib.js 

// by Caio Chassot (http://v2studio.com/k/code/)

Array.prototype.find = function(value, start) {

	start = start || 0;

	for (var i=start; i<this.length; i++) 

		if (this[i]==value)

			return i;

	return false; 

}



Array.prototype.count = function(value) {

	var pos, start = 0, count = 0;

	while ((pos = this.find(value, start))!==false) {

		start = pos + 1;

		count++;

	}

	return count;

}



function isUndefined(v) { 

	var undef;

	return v===undef;

}



function undef(v) {  return  isUndefined(v) }

function isdef(v) {  return !isUndefined(v) }



function map(list, fn) {

	if (typeof(fn)=='string') return map(list, __strfn('item,idx,list', fn));



	var result = [];

	fn = fn || function(v) {return v};

	for (var i=0; i < list.length; i++) result.push(fn(list[i], i, list)); 

	return result;

}



function filter(list, fn) { 

	if (typeof(fn)=='string') return filter(list, __strfn('item,idx,list', fn));



	var result = [];

	fn = fn || function(v) {return v};

	map(list, function(item,idx,list) { if (fn(item,idx,list)) result.push(item) } );

	return result;

}



String.prototype.insert = function(idx,value) { 

	return this.slice(0,idx) + value + this.slice(idx);

}



function getElem(elem) { 

	if (document.getElementById) {

		if (typeof elem == "string") {

			elem = document.getElementById(elem);

			if (elem===null) throw 'cannot get element: element does not exist';

		} else if (typeof elem != "object") {

			throw 'cannot get element: invalid datatype';

		}

	} else throw 'cannot get element: unsupported DOM';

	return elem;

}



function getElementsByClass(className, tagName, parentNode) { 

	parentNode = isdef(parentNode)? getElem(parentNode) : document;

	if (undef(tagName)) tagName = '*';

	return filter(parentNode.getElementsByTagName(tagName), 

		function(elem) { return hasClass(elem, className) });

}



function hasClass(elem, className) { 

	return getElem(elem).className.split(' ').count(className);

}



// ATTACH ROLLOVERS

// This function loops through every image and input tag

// looking for the class "rollover", if found it then preloads

// the rollover image and attaches mouse events for the rollover

// by Tim Walling



// User Defined Variables

var erClassName = "rollover";

var erImageName = "_over";



function newImageName(oldName) {

	var newName = oldName.insert (oldName.length-4,erImageName);

	return newName;

}



function oldImageName(curName) {

	var re = new RegExp (erImageName, 'gi') ;

	var oldName = curName.replace(re, '') ;

	return oldName;

}



function attachRollovers(){

	var btnsTemp = new Array();

	var origSrc = new Array();

	var newSrc = new Array();

	var btnsImage = getElementsByClass(erClassName,'img'); // for images

	var btnsInput = getElementsByClass(erClassName,'input'); // for inputs

	var btns = btnsImage.concat(btnsInput); // combine into one array

	

	for (var i=0; i<btns.length; i++){

		origSrc[i] = btns[i].src;

		newSrc[i] = newImageName(origSrc[i]);

		btnsTemp[i] = new Image();

        btnsTemp[i].src = newSrc[i];

        btns[i].onmouseover = function() {

			var newSrcString = newImageName(this.src);

            this.setAttribute('src',newSrcString)

        }

        btns[i].onmouseout = function() {

			var oldSrcString = oldImageName(this.src);

            this.setAttribute('src',oldSrcString)

        }

	}

}

window.onload = attachRollovers;