window.addEvent('domready', function(){
			var fxRDF = new Fx.Slide('sectionRDF');
			fxRDF.hide();
			$('toggleRDF').addEvent('click', function() {
				var rdf = $E('span', 'toggleRDF');
				if ( rdf.innerHTML == "+" ) {
					rdf.innerHTML = "-";
				}
				else {
					rdf.innerHTML = "+";
				}
				fxRDF.toggle(); 
			});

			var fxRDFS = new Fx.Slide('sectionRDFS');
			fxRDFS.hide();
			$('toggleRDFS').addEvent('click', function() { 
				var rdfs = $E('span', 'toggleRDFS');
				if ( rdfs.innerHTML == "+" ) {
					rdfs.innerHTML = "-";
				}
				else {
					rdfs.innerHTML = "+";
				}
				fxRDFS.toggle(); 
			});
			
			var fxSemanticWeb = new Fx.Slide('sectionSemanticWeb');
			fxSemanticWeb.hide();
			$('toggleSemanticWeb').addEvent('click', function() { 
				var sw = $E('span', 'toggleSemanticWeb');
				if ( sw.innerHTML == "+" ) {
					sw.innerHTML = "-";
				}
				else {
					sw.innerHTML = "+";
				}
				fxSemanticWeb.toggle(); 
			});
});