function returnObjectById( id ) 
{ 
    if (document.getElementById) 
        var returnVar = document.getElementById(id); 
    else if (document.all) 
        var returnVar = document.all[id]; 
    else if (document.layers) 
        var returnVar = document.layers[id]; 
    return returnVar; 
}

function setVisibility(whichLayer, flag)
{
	//alert("Calling setVisbility on: " + whichLayer + " with: " + flag);
	var theStyle = returnObjectById(whichLayer).style;
	theStyle.display = flag? "block":"none";
}