HideEmptyDiv('PlaceHolder_Header');
HideEmptyDiv('PlaceHolder_Top');
HideEmptyDiv('PlaceHolder_LeftColumn');
HideEmptyDiv('PlaceHolder_CenterColumn');
HideEmptyDiv('PlaceHolder_RightColumn');
HideEmptyDiv('PlaceHolder_Bottom');
HideEmptyDiv('PlaceHolder_Footer');

if (document.getElementById('PlaceHolder_LeftColumn').style.visibility == 'hidden') {
    document.getElementById('PlaceHolder_CenterColumn').style.width = '755px';
}
if (document.getElementById('PlaceHolder_RightColumn').style.visibility == 'hidden') {
    document.getElementById('PlaceHolder_CenterColumn').style.width = '755px';
}
if ((document.getElementById('PlaceHolder_RightColumn').style.visibility == 'hidden') && (document.getElementById('PlaceHolder_LeftColumn').style.visibility == 'hidden')) {
    document.getElementById('PlaceHolder_CenterColumn').style.width = '980px';
}