Totalmente seguro provado en FF:
Código html:
Ver original<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <script type="text/javascript"> function ToPrint(elemento){
elemento.setAttribute('class','fuera');
}
input.fuera{
visibility: hidden;
}
input.dentro{
visibility: visible;
}
<input type="button" id="Bimprime" value="Imprimir" class="dentro" onclick="ToPrint(this)">