function showAbout(){

	var page = Ext.get("page");
	var pop = Ext.get("pop");
	pop.createChild({ id: 'popupWindow' }).hide();
	page.setOpacity(.45);

	Ext.Ajax.request({
		url: '../index.php5',
		method: 'GET',
		params: {
			page: 'about'
		},
		scope: this,
		callback: function(options,success,response){
			var htmlText = response.responseText;
			var div = Ext.get("popupWindow");
			
			div.dom.innerHTML=htmlText;
			div.fadeIn({ endOpacity: 1, duration: 2});

			Ext.get("closebutton").on("click",function(){
				Ext.get("popupWindow").remove();
				page.setOpacity(1);
			});

		}
	});
}