$(document).ready(function() {
	$('#nav a').mouseover(function(){
		a = $(this).attr('rel');
		for (j=1;j<6;j++){$('#nav-'+j).attr('src','images/btn-'+j+'.jpg').show();}
		$('#nav-'+a).attr('src', 'images/btn-'+a+'-hover.jpg').show();
	});
	$('#nav a').mouseout(function(){for (j=1;j<6;j++){$('#nav-'+j).attr('src','images/btn-'+j+'.jpg').show();}});
	$('.btn-enviar').click(function() {
		var form = document.contacto;
		if (!form.nom.value){
			$(form.nom).css({ backgroundColor: "#c5d5ff" });
			form.nom.focus();
			return false;
		}else{ $(form.nom).css({ backgroundColor: "#fff" }); }
		if ( /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(form.mail.value)){
			$(form.mail).css({ backgroundColor: "#fff" });
		}else{ 
			$(form.mail).css({ backgroundColor: "#c5d5ff" });
			form.mail.focus();
			return false;
		}
		if (!form.fono.value){
			$(form.fono).css({ backgroundColor: "#c5d5ff" });
			form.fono.focus();
			return false;
		}else{ $(form.fono).css({ backgroundColor: "#fff" }); }
		if (!form.com.value){
			$(form.com).css({ backgroundColor: "#c5d5ff" });
			form.com.focus();
			return false;
		}else{ $(form.com).css({ backgroundColor: "#fff" }); }
	}); 
});