function show(id){
	if(document.getElementById){
		document.getElementById(id).style.display="";
	}else if(document.all){
		document.all[id].style.display="";
	}else if(document.layers){
		document.layers[id].display="";
	}
} 
function hide(id){
	if(document.getElementById){
		document.getElementById(id).style.display="none";
	}else if(document.all){
		document.all[id].style.display="none";
	}else if(document.layers){
		document.layers[id].display="none";
	}
}
function ch(id){
	if(document.getElementById(id).style.display=="none"){
		show(id);
	}else{
		hide(id);
	}
}