function displayDiv(szDivID, iState) // 1 visible, 0 hidden
{
   var obj = document.layers ? document.layers[szDivID] :
   document.getElementById ?  document.getElementById(szDivID).style :
   document.all[szDivID].style;
   obj.visibility = document.layers ? (iState ? "show" : "hide") :
   (iState ? "visible" : "hidden");
}
/////////////////////////////
function Roll_gif(id,over)
{
	if(window.document.images) 
	{
		if (over)
			window.document.images[id].src = "images/" + id + "_over.gif";
		else
			window.document.images[id].src =  "images/" + id + ".gif";
	}
}