function cambiarBoton(a,b){if(document.images){if(document.images[b].permitirloaded){if(a==1){document.images[b].src=document.images[b].permitir.src}else{document.images[b].src=document.images[b].permitir.oldsrc}}}}function preloadCambiarBoton(a,b){if(document.images){a.onload=null;a.permitir=new Image();a.permitir.oldsrc=a.src;a.permitir.src=b;a.permitirloaded=true}}function cambiaClaseById(a,c,b){var d=document.getElementById(a);if(d.className==c){d.className=b}else{d.className=c}};