seekline
seekline(nextline);
seekline(1);
seekline(topline);
seekline(1);
seekline(topline);
seekline(topline);
seekline(topline);
seekline(totallines);
seekline(1);
seekline(topline);
seekline(nextline);
seekline(1);
seekline(nextline);
seekline(i + topline);
seekline(topline); /* restore the line pointer */
seekline(1);
seekline(topline);
void seekline(int line);