function cbl_selectAll(status)
{
    var linkButtonDes = document.getElementById("ctl00_ctl00_ContentPlaceHolderBody_ContentPlaceHolderColonnaCentro_lbtn_DeselectAll");
    var linkButtonSel = document.getElementById("ctl00_ctl00_ContentPlaceHolderBody_ContentPlaceHolderColonnaCentro_lbtn_SelectAll");

    if (status == true)
    {
        linkButtonDes.style.display = "inline";
        linkButtonSel.style.display = "none";
        Select(status);       
    }
    else
    {
        linkButtonDes.style.display = "none";
        linkButtonSel.style.display = "inline";
        Select(status);        
    }   
    return false; 
}

function Select(Select)
{
    for (var n=0; n < document.forms[0].length; n++)
     {
        if (document.forms[0].elements[n].type=="checkbox")
            document.forms[0].elements[n].checked=Select;
     }          
}