Selecting Checkbox

[ashishrathore]

hi,

i am having prob regarding checking all/none checkboxes

here is a snapshot of that page that i want to refer




Select Category :

cat1 subcat11 subcat12

cat2 subcat21 subcat22 subcat23

cat3 subcat31 subcat323

cat5 subcat51 subcat52 subcat53 subcat54

cat9 subcat91 subcat92



all the cat[i] are main categories and in front of that there are corrosponding subcategories subcat[i]

what i want is when i select a cat[i] then all the corrosponding subcat[i] must be selected

mind u the problem is that all these categories and the subcategories are dynamically taken from a text file so it is not fixed for a certain number of lines.

i had created the function using JS for this but when i select any cat[i] all the subcat[i] of all the categories are selected, so i want only the corrosponding subcat[i] to be selected and not the all subcat[i].


here is my JS function

function checkAll(checkname, exby)
{
for (i = 0; i < checkname.length; i++)
checkname[i].checked = exby.checked? true:false
} //////// but it check all the subcategories and not the corrosponding subcat[i].


the code 4 checkboxes is smthng like this.....

<input type=checkbox name="main[]" value="<?php echo "$mainh"; ?>" onClick="checkAll(document.pform.sub,this)"> ///this is the main category part

<input type=checkbox name="sub" value="<?php echo "$subname"; ?>"><?php echo "$sub"; ?> /////this is 4 generating subcategories.

plz help me....
-ashish