function showLoader(loader) {
	if (typeof(loader) == 'undefined') {
		loader = 'div.loader';
	}
	$(loader).css({opacity: 1, visibility: 'visible'});
}
function hideLoader(loader) {
	if (typeof(loader) == 'undefined') {
		loader = 'div.loader';
	}
	$(loader).fadeTo(250, 0);
}

function getQueryVar(key, url, default_) {
	if (default_ == null) default_ = "";
	key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
	var regex = new RegExp("[\\?&]"+key+"=([^&#]*)");
	if (url)
		var qs = regex.exec(url);
	else
		var qs = regex.exec(window.location.href);
	if (qs == null)
		return default_;
	else
		return qs[1];
}