function AddClass(obj,cName)
{
    KillClass(obj,cName);
    return obj&&(obj.className+=(obj.className.length>0?' ':'')+cName);
}

function KillClass(obj,cName)
{
    return obj&&(obj.className=obj.className.replace(new RegExp("^"+cName+"\\b\\s*|\\s*\\b"+cName+"\\b",'g'),''));
}

function HasClass(obj,cName)
{
    return(!obj||!obj.className)?false:(new RegExp("\\b"+cName+"\\b")).test(obj.className)
}