function show_description(id) {
		var obj = document.getElementById(id);
		
		var brand = new Array();
		brand[0] = "interop";
		brand[1] = "voicecon";
		brand[2] = "web_20_expo";
		brand[3] = "web_20_summit";
		brand[4] = "enterprise_20";
		brand[5] = "mbx";
		brand[6] = "cloudsummit";
		brand[7] = "csi";
		brand[8] = "black_hat";
		brand[9] = "gtec";
		brand[10] = "mass_events_labs";
		brand[11] = "cloudconnect";
		brand[12] = "gov_20_expo";
		brand[13] = "initial_landing_content"; //this is the initial content when someone first visits the site
		
		if(obj.style.display == "none") {
			obj.style.display = "";
		}
		
		for (i=0; i<brand.length; i++) {
			if(document.getElementById(brand[i]) != obj) {
				document.getElementById(brand[i]).style.display = "none";
			}
		}
	} // End 'show_description'