function getObj(name){
    if (document.getElementById){// DOM
        return document.getElementById(name);
    } else

    if (document.all){// IE - pre v5
        return document.all[name];
    } else

    if (document.layers){// NS - pre mozilla
        return document.layers[name];
    } else
        return false;
}


function showHide(){
    var objBodyText = getObj('body-text');
    var objBodyTextClassName = objBodyText.className;
    var objSubNav = getObj('sub-nav');
    var objShowhide = getObj('showhide');
        
    if (objBodyTextClassName=='body-text') {
        objBodyText.className='body-text-opaque'; 
        if (objSubNav != null) 
            objSubNav.className='sub-nav-opaque';
        objShowhide.className='hide';
        
    } else if (objBodyTextClassName=='body-text-opaque') {
        objBodyText.className='body-text-hidden';
        if (objSubNav != null) 
            objSubNav.className='sub-nav-hidden';
        objShowhide.className='show';
        
    } else if (objBodyTextClassName=='body-text-hidden') {
        objBodyText.className='body-text';
        if (objSubNav != null) 
            objSubNav.className='sub-nav';
        objShowhide.className='hide';
    }
}