[hyony]

Thank you so much for your replying

What i mean is that. On the left side menu where it lists categories:

Left side Category Navigation

Main Category 1
Main Category 2
Main Category 3
Main Category 4
Main Category 5
Main Category 6

When you click on the Category 1 Link, it will show the sub-category like this:

Left side Category Navigation

Main Category 1

Sub-category 1
Sub-category 2
Sub-category 3
Sub-category 4

Main Category 2
Main Category 3
Main Category 4
Main Category 5
Main Category 6

And it shows the articles' contained in that category & its sub-cat in the center & right blocks like the current version in stead of going to the new page which contain only the sub-categories & a link back to the mainpage.

Also When you click on Main Category 2, it will hide the sub-cat of Category 1 and show only Main Category 2's sub-categories like below

Left side Category Navigation

Main Category 1
Main Category 2

Sub-category 1
Sub-category 2
Sub-category 3
Sub-category 4

Main Category 3
Main Category 4
Main Category 5
Main Category 6

This category menu should shows on every page to make readers selecting and going between category easier & faster.

I hope this would make you getting a little on what i'm trying to say !!