if(document.layers){
	Refcapa='document.'
	Refestilo=''
	Reftop='.top'
	Refleft='.left'
}else if(document.all){
	Refcapa=''
	Refestilo='.style'
	Reftop='.pixelTop'
	Refleft='.pixelLeft'
} 

function mostrarcapa(capa){
	eval(Refcapa+capa+Refestilo+'.display="block"');
}  

function ocultarcapa(capa){
	eval(Refcapa+capa+Refestilo+'.display="none"');
}