/*
 * FOSSWeb photo gallery navigation functions
 */

// for the next/back rollover swapping
function swapimage( img, num ) {
	document.images[img].src = "../../../../images/"+img+num+".gif";
}

// for the next/back navigation
//  var totalpages is set by "thisgallery.js" which will be in the gallery folder
var pageprefix = "photo_gallery_pic";
var pagesuffix = ".html";
var indexpage = "photo_gallery.html";
function thisPage() {
	var pageURL = document.location.toString();
	var numInd = pageURL.indexOf(pageprefix) + pageprefix.length;
	var numEnd = pageURL.indexOf(pagesuffix);// - numInd;
	var pnum = parseInt(pageURL.substring(numInd, numEnd));
	return pnum;
}
function prevpage() {
	var pnum = thisPage();
	var prevp = (pnum > 1) ? pageprefix + (pnum-1) + pagesuffix : indexpage;
	location.href = prevp;
}
function nextpage() {
	// pick a default in case somebody forgets to set the total number of pages for the gallery
    if(typeof(totalPages)!="number") { totalPages = 8; }
	var pnum = thisPage();
	var nextp = (pnum < totalPages) ? pageprefix + (pnum+1) + pagesuffix : indexpage;
	location.href = nextp;
}