function Imprimir(){
var DataImprimir = document.getElementById('contenido_imprimible').innerHTML;
var html='\n\n\n<\/head>\n\n\n';
html+=DataImprimir;
html+='\n<\/div>\n<\/body>\n<\/html>'
parent.print_buffer.document.write(html);
parent.print_buffer.document.close();
}