function showPopup(url, name, width, height, scroll, resizable, statusbar, screenpos) {

	var Xwin = width;

	var Ywin = height;

	var Xsize = screen.availWidth;

	var Ysize = screen.availHeight;

	var Xpos = 0;

	var Ypos = 0;

	switch(screenpos) {

		case "topleft":

			Xpos = 0;

			Ypos = 0;

			break;

		case "topright":

			Xpos = Xsize - width;

			Ypos = 0;

			break;

		case "bottomleft":

			Xpos = 0;

			Ypos = Ysize - height;

			break;

		case "bottomright":

			Xpos = Xsize - width;

			Ypos = Ysize - height;

			break;

		default:

			Xpos = (Xsize - width) / 2;

			Ypos = (Ysize - height) / 2;

			break;

	}

	var popwin;

	var opts = "status=" + statusbar + ",resizable=" + resizable + ",scrollbars=" + scroll + ",height=" + Ywin + ",width=" + Xwin + ",left=" + Xpos + ",top=" + Ypos;

	popwin = window.open(url, name, opts);

	popwin.focus();

}