var ids = new Array("ja", "en");
var i;

for (i = 0; i < ids.length; i++) {
    (new Image()).src = 'img/je_' + ids[i] + '_b.gif';
    (new Image()).src = 'img/je_' + ids[i] + '_g.gif';
}

function ro(id, c)
{
    if (document.images) {
	document.images[id].src = 'img/je_' + id + '_' + c + '.gif';
    }
}