function popup(mylink, windowname, width, height, scrollbars, menubar)

{
if (! window.focus)return true;
var href;
if (typeof(mylink) == 'string')
   href=mylink;
else
   href=mylink.href;
window.open(href, windowname, 'width=' + width + ', height=' + height + ', scrollbars=' + scrollbars +', menubar=' + menubar);
return false;
}