See if you can help me with this problem

Hi all. I'm stuck and need some help with javascript.

I have a tree view where 170 items are divided in 53 categories. Some of these items appear in more than one category. I need to be able to select all the same items in different categories when a user selects one item in case it's repeated. Here's an example

------------------
Administration/Management/HR
Administration and Leadership Issues
Consulting
Cultural Diversity
Health Services Administration
Nursing Home Administration

Long Term Care
Geriatrics
Home Health Care
Nursing Home Administration
Long Term care
-------------------

As you can see Nursing Home Administration shows up on both categories. All items come with a checkbox. What I need is to when a user checks Nursing Home Administration (for instance) all Nursing Home Administration gets checked wherever they appear. Basically one click checks all alike items.

Thank you for any help.

You have to post your code or better a link to your site.

this code will let you get the elements by a class name, so all you'll have to do is give them a distinct class name for that group

document.prototype.getElementsByClass = function(theClass){
els = document.getElementsByTagName("*");
elements = new Array();
pattern = new RegExp('(^| )'+theClass+'( |$)')
for(i = 0; i < els.length; i++){
cls = els[i].className;
if(pattern.test(cls)){
elements.push(els[i]);
}
}
return elements;
}