var layerRef="null", styleSwitch="null";
if (navigator.appName == "Netscape") {
layerRef="document.layers";
styleSwitch="";
}else{
layerRef="document.all";
styleSwitch=".style";
}

function hideLayer(layerName){
eval(layerRef+'["'+layerName+'"]'+styleSwitch+
'.visibility="hidden"');
}
function showLayer(layerName){
eval(layerRef+'["'+layerName+'"]'+styleSwitch+
'.visibility="visible"');
};


function MM_preloadImages() 
{  var imglist = new Array ("but1b.jpg","but2b.jpg","but3b.jpg","but4b.jpg","but5b.jpg","but6b.jpg","but7b.jpg","but8b.jpg","but9b.jpg","but10b.jpg","but11b.jpg","but13b.jpg","but14b.jpg","but30b.jpg","but31b.jpg");
var imgs = new Array();var count;
 if (document.images)for (count=0; count<imglist.length; count++){imgs[count]=new Image(); 
 imgs[count].src=imglist[count];}; };