isDOM=document.getElementById //DOM1 browser (MSIE 5+, Netscape 6, Opera 5+)
//+
var myimages=new Array() 
function preloadimages()
{ 
if(isDOM)
{
for (i=0;i<preloadimages.arguments.length;i++)
{ 
myimages[i]=new Image();
myimages[i].src=preloadimages.arguments[i];
} 
}
}
//+
function act(actor)
{
if(isDOM){
imaga=actor.substr(0,actor.length);
buffer=eval("document."+actor+".src");
xbuffer=buffer.substr(buffer.length-7,7);
if(xbuffer=='_on.gif')
{ 
eval("document."+actor+".src='pigs/"+imaga+".gif'");
}
else
{
eval("document."+actor+".src='pigs/"+imaga+"_on.gif'");
}
}
}
//+