function hidden_id(id_name){
	document.getElementById(id_name).style.display='none';
}
function show_id(id_name){
	document.getElementById(id_name).style.display='';
}
function hidden_all(){
	hidden_id('Layer1');
	hidden_id('Layer2');
	hidden_id('Layer3');

}
function show_oneid(id_name){
	 if (id_name=='Layer1')
	 {
	 	show_id('Layer1');
	 }else{
	 	hidden_id('Layer1');
	 }
	 
	 
	  if (id_name=='Layer2')
	 {
	 	show_id('Layer2');
	 }else{
	 	hidden_id('Layer2');
	 }
	 
	  if (id_name=='Layer3')
	 {
	 	show_id('Layer3');
	 }else{
	 	hidden_id('Layer3');
	 }

}