function trocar(obj){
			obj.src="images/btHome2.gif";
			}
			
			function voltar(obj){
			obj.src="images/btHome.gif";
			}
			
			function trocar2(obj){
			obj.src="images/btCursos2.gif";
			}
			
			function voltar2(obj){
			obj.src="images/btCursos.gif";
			}
			
			function trocar3(obj){
			obj.src="images/btEventos2.gif";
			}
			
			function voltar3(obj){
			obj.src="images/btEventos.gif";
			}
			
			function trocar4(obj){
			obj.src="images/btFotos2.gif";
			}
			
			function voltar4(obj){
			obj.src="images/btFotos.gif";
			}
			
			function trocar5(obj){
			obj.src="images/btHistoria2.gif";
			}
			
			function voltar5(obj){
			obj.src="images/btHistoria.gif";
			}
			
			function trocar6(obj){
			obj.src="images/btContato2.gif";
			}
			
			function voltar6(obj){
			obj.src="images/btContato.gif";
			}