function popup(mylink, windowname, w, h)
{
if (! window.focus)return true;
var href;
if (typeof(mylink) == 'string')
   href=mylink;
else
   href=mylink.href;

windowSizeStr = "width = "+ w + ", height=" + h + ", scrollbars=yes";   
    
window.open(href, windowname, windowSizeStr);
return false;
}