getUrlKey = function(key, query)
{
	if (!query) query = window.location.search;	
	var re = new RegExp("[?|&]" + key + "=(.*?)&");
	var matches = re.exec(query + "&");
	if (!matches || matches.length < 2) return "";
	return decodeURIComponent(matches[1].replace("+", " "));
}

setUrlKey = function(key, value, query)
{
	query = query || window.location.search;
	var q = query + "&";
	var re = new RegExp("[?|&]" + key + "=.*?&");
	if (!re.test(q)) q += key + "=" + encodeURI(value);
	else q = q.replace(re, "&" + key + "=" + encodeURIComponent(value) + "&");
	q = q.trimStart("&").trimEnd("&");
	return q[0]=="?" ? q : q = "?" + q;
}

String.prototype.trimEnd = function(c)
{
	if (c) return this.replace(new RegExp(c.escapeRegExp() + "*$"), '');
	return this.replace(/\s+$/, '');
}

String.prototype.trimStart = function(c)
{
	if (c) return this.replace(new RegExp("^" + c.escapeRegExp() + "*"), '');
	return this.replace(/^\s+/, '');
}

String.prototype.escapeRegExp = function()
{
	return this.replace(/[.*+?^${}()|[\]\/\\]/g, "\\$0");
}