$.fn.isShow = function()
{
	if(this.length > 0)
		return this.css('display') != 'none';
	return null;
}

$.fn.autohelp = function(t, o) {
	o = o || this;
	var tmp;
	var h;
	this.hover(
		function() {
			tmp = $(t, $(o).parent().parent());
			h = tmp.html();
			tmp.html(this.title);
		},
	  function() {
	  	tmp.html(h);
	 	});
	return this;
};