redirect using java script get pass parameter?

hi anyon help me? how can i pass my parameter value to may redirect page if im using java script? thanks
#javascript
function Brand() {
        window.location = 'k_brandlist.aspx?id=?????';

    }
///tags
    <input type="image" value="1" onclick="return Brand();"  title="Britanny" id="i_brit" src="images/brittany.png" />


when i click the button it will function to brand(); but i need it to redirect to my k_brandlist.aspx with the parameter id? how  can i do that thanks

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