function CORE()
{
   this.GetObjectByID = function(BlockID, objDocument)
     {
        if (objDocument == undefined)
          objDocument = document; 

        var objBlock = ((objDocument.all) ? objDocument.all[BlockID] : objDocument.getElementById(BlockID));

        return objBlock;
     }

   //+---

   this.BlockSwitch = function(BlockID, objDocument)
     {
        if (objDocument == undefined)
          objDocument = document; 

        var objBlock = ((objDocument.all) ? objDocument.all[BlockID] : objDocument.getElementById(BlockID));
        var isHidden = ((objBlock.style.display == "none") || (objBlock.style.display == ""));

        objBlock.style.display = ((isHidden) ? "block" : "none");
     }
}

var objCore = new CORE();