var current = 1;

$(document).ready(function(){
	$("#js-alert1").hide();
	$("#js-alert2").hide();
	$("#content"+current).show("fast");
});

function changeContent(id)
{
	$("#content"+current).hide("fast", function()
					   {
						current = id;
						$("#content"+current).show("fast");   
					   });
		
}