function popup(mylink, windowname, style)
{
if (! window.focus)return true;
var href;
if (typeof(mylink) == 'string')
   href=mylink + "&stylesheet=style";
else
   href=mylink.href + "&stylesheet=" + style;
window.open(href, windowname,'scrollbars=yes,resizable=yes,toolbar=no');
return false;
}