Read and Update permissions

Hello all,

I am looking for some ECMA Javascript :

The following scenario is for a SharePoint list .I want to display 2 buttons in the ribbon section(allitems.aspx)

1)There should be 1 group "Resource Group" and 2 ribbon buttons (Set Read and Set Contribute)

2)If one button is enabled the other should be grayed out.

3)If I click on button1 (Set Read)...The "Resource Group" should be set to read permission level and vice versa.

Any Ideas?

Like Cricket