function launchCenteredWin(url,winWidth,winHeight) {
	//  tempting to set it to 0 for users whose browsers dont expose screen.width, and screen.height, but setting it to 20 wont mess with users who keep taskbar docked at either the top or the left of the screen...

	var x = (screen.width) ? (screen.width-winWidth)/2 : 20;
	var y= (screen.height) ? ((screen.height-winHeight)/2) : 20;
	
	//winHeight = (is_nav4) ? (winHeight+10) : winHeight;
	
	var settings = 'width='+winWidth + ',height='+winHeight+',top='+y+',left='+x+',scrollbars=yes';
	var winName = "winFor" + winWidth + "x" + winHeight;
	newwin = window.open(url,winName,settings);
	if (window.focus) {
		setTimeout('newwin.focus();',250);
	}
}