function printDIV(){ 
    var a = window.open('','','width=900,height=600'); 
    a.document.open("text/html"); 
    a.document.write('<html><head><link rel="stylesheet" href="css/screen.css" /></head><body><div class="print_div">'); 
    a.document.write(document.getElementById('catalogo').innerHTML); 
    a.document.write('</div></body></html>'); 
    a.document.close(); 
    a.print(); 
}
