var thumbs = 20;
var thumbwidth = 200;
var maxcols = 6;
var mincols = 3;
var defcols = 5;
var adWidth = 0;

function findWidth()
{
	var width = 1200;
	if (typeof(window.innerWidth) == 'number')
		width = window.innerWidth;
	else if (document.documentElement &&
		 (document.documentElement.clientWidth)) 
		width = document.documentElement.clientWidth;
	else if (document.body && (document.body.clientWidth))
		width = document.body.clientWidth;
	return width;
}

function findParam(param, def)
{
	param += "=";
	var res = def;
	URL = self.location.href;
	var p = URL.indexOf(param);
	if (p == -1)
	{
		return res;
	} else
	{
		var temp = URL.substring(p + param.length);
		pe = temp.indexOf("&");
		if (pe == -1) pe = temp.length;
		res = temp.substring(0, pe);
	}
	return Number(res);
}

function setParam(URL, param, value)
{
	param += "=";
	var p = URL.indexOf(param);
	if (p == -1)
	{
		URL += "&";
		URL += param;
		URL += String(value);
		return URL;
	} else
	{
		p += param.length;
		var pre = URL.substring(0, p);
		post = URL.substring(p);
		pe = post.indexOf("&");
		if (pe == -1) post = "";
		else post = post.substring(pe);
		pre += String(value);
		return (pre + post);
	}
}

function reSizeTable()
{
	var width = findWidth();
        width = width - adWidth
	cols = parseInt(width / thumbwidth);
	if (cols < mincols) cols = mincols;
	if (cols > maxcols) cols = maxcols;
	if (findParam("cols", defcols) != cols)
	{
		rows = parseInt(thumbs / cols);
		if (rows < 1) rows = 1;
		URL = self.location.href;
		URL = setParam(URL, "cols", cols);
		URL = setParam(URL, "thumbs", cols * rows);
		if (document.images)
			window.location.replace(URL);
		else
			window.location.href = URL;
	}
}

function addColParams()
{
	var width = findWidth();
	width = width - adWidth
	cols = parseInt(width / thumbwidth);
	if (cols < mincols) cols = mincols;
	if (cols > maxcols) cols = maxcols;
	var rows = parseInt(thumbs / cols);
	if (rows < 1) rows = 1;
	document.f.cols.value = cols;
	document.f.thumbs.value = rows * cols;
        return true;
}