/*
Script for simple image swap and restore
Requires getElementById (native or emulated)

Rev 2: Supports exceptions in the "swap_exceptions" array.
*/

var IMAGESWAP_JS = true;
var swap_exceptions = new Array();

var swaplist=new Array();

function copy_root(oldfn, newfn)
{
	var root = oldfn.match(/.+[\/]/);
	return root+newfn;
}

function in_array(str, array)
{
	if (typeof(str) == 'object') {
		// Got it backwards
		var was_array = array;
		array=str;
		str=was_array;
	}
	
	for (var i=0; i<array.length; i++) {
		if (array[i]==str) {
			return true;
		}
	}
	
	return false;
}

function swap(id, newsrc, same_root)
{
	if (document.getElementById) {
		var img = typeof(id)=='string'?document.getElementById(id):id;
		if (!in_array(id, swap_exceptions)) { // Allows an exception list for things like "current page" images that shouldn't be swapped.
			newsrc = same_root ? copy_root(img.src, newsrc) : newsrc;
			swaplist[id] = img.src;
			img.src = newsrc;
		}
	}
}

function unswap(id)
{
	if (document.getElementById) {
		if (!in_array(id, swap_exceptions)) { // Allows an exception list for things like "current page" images that shouldn't be swapped.
			var img = typeof(id)=='string'?document.getElementById(id):id;
			img.src = swaplist[id];
		}
	}
}