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delete item from dhtml tree

Hello,

I am trying to delete item from dhtml tree. I would like to display confirmation message prior to the delete. In my modal I am using command buttons and as a result whole page is reloaded. Is there any technique to display message confirming delete with the option of cancel on client side without going to the application server. Here is a fragment from my modal:

            <h:commandButton            
            value="OK"
            type="button"
            onclick="tree.deleteItem(tree.getSelectedItemId(),true);"/>
            <h:commandButton            
            value="CANCEL"
            type="button"
            onclick="Richfaces.hideModalPanel('DeleteFolderModalPanel')"/>

Please help.

h:commandButton converted by jsd to the <input type="submit" which will send form to the server on click
You can 
 - use can use native HTML button
or
 - use exestng tag but with   onclick="tree.deleteItem(tree.getSelectedItemId(),true); return false; "/>