function abrir(URL) {
var width = 320;
var height = 241;
var left = 20;
var top = 20;
window.open(URL,'carcasa', 'width='+width+', height='+height+', top='+top+', left='+left+', scrollbars=no, status=no, toolbar=no, location=no, directories=no, menubar=no, resizable=no, fullscreen=no');
}