// http://www.west-wind.com/weblog/posts/891992.aspx
$.maxZIndex = $.fn.maxZIndex = function(opt){
	var def = { inc: 10, group: "*" };
	$.extend(def, opt);
	var zmax = 0;
	$(def.group).each(function(){
		var cur = parseInt($(this).css('z-index'));
		zmax = cur > zmax ? cur : zmax;
	});
	if(!this.jquery)
		return zmax;
	return this.each(function(){
		zmax += def.inc;
		$(this).css("z-index", zmax);
	});
}