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

	window.open(pageToLoad,winName,args);
}