function popup(url, myname, w, h, scroll){
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll
	win = window.open(url, myname, winprops)
	if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
	// use : onclick="popup(this.href,'name','400','400','no');return false;"
}