var win=null;
function mostrarimagen(url_imagen,titulo){
var img = new Image();
img.src = url_imagen;
ancho = img.width
alto = img.height + 50
win=window.open('',''+titulo+'','width='+ancho+',height='+alto+',scrollbars=no,resizable=0,toolbar=0, top=20, left=100');
win.document.write ('\n');
win.document.write (' \n');
win.document.write (' '+titulo+'\n');
win.document.write (' \n');
win.document.write (' \n');
win.document.write (' \n');
win.document.write ('  | \n');
win.document.write ('
\n');
win.document.write (' \n');
win.document.write (' | \n');
win.document.write ('
\n');
win.document.write (' \n');
win.document.write (' \n');
win.document.write ('\n');
}