function showHideElem(toShow, toHide)
{
    if(document.getElementById(toShow))
    {
        document.getElementById(toShow).style.display = 'block';
    }
    if(document.getElementById(toHide))
    {
        document.getElementById(toHide).style.display = 'none';
    }
}

function toggleElem(elem)
{
    if(document.getElementById(elem))
    {
        if(document.getElementById(elem).style.display == 'block')
            document.getElementById(elem).style.display = 'none';
        else
            document.getElementById(elem).style.display = 'block';
    }
}