function abre(imagen) {
if (window.screen) {
var aw = (screen.availWidth-550)/2;
var ah = (screen.availHeight-550)/2;
}
var win = window.open("", "win4", "width=550,height=550,top="+ah+",left="+aw+",toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no");
var doc = win.document;
doc.open("text/html", "replace");
doc.writeln("Book");
doc.writeln("");
doc.writeln("![](ilustraciones/"+imagen+") |
");
doc.close();
}