ns4 = (document.layers)? true:false;
ie4 = (document.all)? true:false;
ns6 = (document.getElementById && !document.all)? true:false;

var currentid = 'id';
function Roll(ImgNam, status)
	{

	if (ImgNam!=currentid)
		{
			document.images[ImgNam].src="images/nav_" + ImgNam + status + ".gif";
		} else

		{
			document.images[ImgNam].src="images/nav_" + ImgNam + "_on.gif";
		}
}

function Preload() {var doc=document; if(doc.images){ if(!doc.pl) doc.pl=new Array();var i,j=doc.pl.length,a=Preload.arguments;for(i=0; i<a.length; i++) if (a[i].indexOf("#")!=0){doc.pl[j]=new Image; doc.pl[j++].src=a[i];}}}

function oShow(id) {
            if (ns4) {document.layers[id].visibility = "show";}
            else if (ie4) {document.all[id].style.visibility = "visible";}
            else if (ns6) {document.getElementById(id).style.visibility = "visible";}
}

function oHide(id) {
            if (ns4) {document.layers[id].visibility  = "hide";}
            else if (ie4) {document.all[id].style.visibility = "hidden";}
            else if (ns6) {document.getElementById(id).style.visibility = "hidden";}
}