function buttonMouseOver(el)
{    
    //el.setAttribute('class', 'buttonmouseover'); 
    el.className = 'buttonmouseover';
}

function buttonOnKeyDown(el)
{   
    //el.setAttribute('class', 'buttononkeydown'); 
    el.className = 'buttononkeydown';
}

function buttonReadyState(el)
{    
    el.className = 'button';
}