function init(){

  if (navigator.appName == "Netscape")
 	{
   layerStyleRef="layer.";
       layerRef="document.layers";
    styleSwitch="";
  	}

else
	{
    layerStyleRef="layer.style.";
       layerRef="document.all";
    styleSwitch=".style";
  	}

}
 


	
function show(pre){
document.prev.src=pre
}

function sm(nm){
hd()
tm()
eval(layerRef+'["'+nm+'"]'+styleSwitch+'.visibility="visible"');
}

var TimerID= null
init()

function tm()
{
clearTimeout(TimerID)
TimerID = setTimeout("hd()", 4000);
}
function ni(kk,rr)
{
eval('document.'+kk+'.src="image/'+rr+'.gif"');
}

function la(kk,rr)
{
tm()
  if (navigator.appName == "Netscape")
 	{
eval('document.men1.document.'+kk+'.src="image/'+rr+'.gif"');
	}
else {
eval('document.'+kk+'.src="image/'+rr+'.gif"');
}
}

function lb(kk,rr)
{
tm()
  if (navigator.appName == "Netscape")
 	{
eval('document.men2.document.'+kk+'.src="image/'+rr+'.gif"');
	}
else {
eval('document.'+kk+'.src="image/'+rr+'.gif"');
}
}

function lc(kk,rr)
{
tm()
  if (navigator.appName == "Netscape")
 	{
eval('document.men3.document.'+kk+'.src="image/'+rr+'.gif"');
	}
else {
eval('document.'+kk+'.src="image/'+rr+'.gif"');
}
}