function popup(conn) {
		var sW = 800 //screen.availWidth;
		var sH = 800 //screen.availHeight;
		var bookaddr;
		if(conn == 'sym'){
			bookaddr = '/includes/symbols.asp';
		}else{
			bookaddr = '/includes/converter.asp';
		}
		popupWindow = window.open(bookaddr,'ebook','width='+sW+',height='+sH+',screenX=0,screenY=0,top=0,left=0,scrollbars=yes,menubar=no');
 	    popupWindow.focus();
}