function popup(mylink, winWidth, winHeight, windowname)
{
	if (! window.focus)return true;
	var href;
	if (typeof(mylink) == 'string')
	   href=mylink;
	else
	   href=mylink.href;
	   
	var extraStr;
	extraStr = "width="+winWidth+",height="+winHeight+",scrollbars=no";
	window.open(href, windowname, extraStr);
	return false;
}