function mostrarCapa(c){
		var capa;
		switch (navigator.appName){
		
			case "Microsoft Internet Explorer":
				capa=document.getElementById(c);
				capa.style.visibility="visible";
				break;
			
			case "Netscape":
				//Si el navegador es Netscape 6
				if (navigator.appVersion.substring(0,3)=="5.0"){
					capa=document.getElementById(c);
					capa.style.visibility="visible";
					break;
				}
				else{
					capa=document.layers[c];
					capa.visibility="show";
					break;
				 }
		}
	}
	
	function ocultarCapa(c){
		var capa;
		switch (navigator.appName){
		
			case "Microsoft Internet Explorer":
				capa=document.getElementById(c);
				capa.style.visibility="hidden";
				break;
			
			case "Netscape":
				if (navigator.appVersion.substring(0,3)=="5.0"){
					capa=document.getElementById(c);
					capa.style.visibility="hidden";
					break;
				}
				else{
					capa=document.layers[c];
					capa.visibility="hide";
					break;
				}
		}
	}
function sobre (src, color_sobre ) { 	

	src.style.cursor = "hand";
	src.style.backgroundColor = color_sobre ; 		
		
} 
function fuera (src, color_fuera ) { 
	src.style.cursor = "default"; 
	src.style.backgroundColor = color_fuera ;
}