function open_win( pageToLoad, winName, width, height, center) {
	xposition=0; yposition=0;
	if ((parseInt(navigator.appVersion) >= 4 ) && (center)) {
		xposition = (screen.width - width) / 2;
		yposition = (screen.height - height) / 2;
	}
	args = "width=" + width + ",height=" + height + 
	",location=0,menubar=0,resizable=1,scrollbars=0,status=0,titlebar=0,toolbar=0,hotkeys=0,screenx=" + 
	xposition + ",screeny=" + yposition + ",left=" + xposition + ",top=" + yposition;
	window.open( pageToLoad,winName,args );
}