function pop_win(strUrl, strTitle, 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+',noresize'
	win = window.open(strUrl, strTitle, winprops);

	if (parseInt(navigator.appVersion) >= 4) {
		win.focus();
	}
}