Customizing tab indentation width

[Sona]

Hi,

I want to set the default tab indetation width in emacs to be 2 spaces. 
I set this in the tab-with variable and also in the standard indent 
variable but it's not working. For example, if I type the following:

if (someVariable == true) {
    doSomething();
}

it indents doSomething() to 4 spaces.. I need this to be 2 spaces only. 
How can I do this? Thanks


Sona