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Problem While using check boxes

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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 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 i need help for check box having "all" check box and a single subjectname checkbox.

I am working on a application where i have five check boxes.First checkbox name is 'All' and name for other four checkboxes are 'Subjectname'. if i have a screen where all five checkboxes are displayed when i check in first check box i am getting no problems. but when i have a screen displaying only 'All' check box and single subjectname check box when i click check in 'All' checkbox i am getting a alert message as undefined can i solve this problem. i am using html and javascript.


function Check(tt)
for (i = 0; i < ; i++)
tt[i].checked = true ;

for (i = 0; i < y; i++)
tt[i].checked = false ;

<input type="checkbox" name="Check_ctr" value="yes"
<input type="checkbox" name="checkbox1" value="Subjectname1">

<input type="checkbox" name="checkbox1" value="Subjectname2">

<input type="checkbox" name="checkbox1" value="Subjectname3">

<input type="checkbox" name="checkbox1" value="Subjectname4">

<input type="checkbox" name="checkbox1" value="Subjectname5">

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however, you will find more examples in search...

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