This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Thanks for your suggestion . But the actual problem is that i have a five check boxes where first check box name is "all" and other four check box name is subject names and their values are different.when i click the " all " checkbox the other subjectname check boxes will be checked or selected.so it works finer when i have more than one subject name.but when i have single subject name and when i click the" all " check box it throws an error message as undefined length.so i need help for check box having "all" check box and a single subjectname checkbox.