//Precarga de imágenes
var sp1 = new Image();
sp1.src = "../images/espana.gif";
var sp2 = new Image();
sp2.src = "../images/espana2.gif";

var uk1= new Image();
uk1.src = "../images/uk.gif";
var uk2 = new Image();
uk2.src = "../images/uk2.gif";

var gm1 = new Image();
gm1.src = "../images/german.gif";
var gm2 = new Image();
gm2.src = "../images/german2.gif";

var fr1 = new Image();
fr1.src = "../images/france.gif";
var fr2 = new Image();
fr2.src = "../images/france2.gif";

var sw1 = new Image();
sw1.src = "../images/sweden.gif";
var sw2 = new Image();
sw2.src = "../images/sweden2.gif";

var jp1 = new Image();
jp1.src = "../images/japan.gif";
var jp2 = new Image();
jp2.src = "../images/japan2.gif";

var ch1 = new Image();
ch1.src = "../images/china.gif";
var ch2 = new Image();
ch2.src = "../images/china2.gif";

var tw1 = new Image();
tw1.src = "../images/taiwan.gif";
var tw2 = new Image();
tw2.src = "../images/taiwan2.gif";

var kr1 = new Image();
kr1.src = "../images/koreas.gif";
var kr2 = new Image();
kr2.src = "../images/koreas2.gif";