doc=document;
function P(id){if((doc.layers)&&(id!='')){Ob=eval('doc.layers.'+id+'.document.images')}else Ob=doc;return Ob}
function ImOn(id,name){Ob=P(id);on=eval(name+"On.src");Ob[name].src=on} 
function ImOut(id,name){Ob=P(id);out=eval(name+"Of.src");Ob[name].src=out}