function view_layer(val){
	var total= 9;
	var val_select = "";
	if(val < 10) {
		val_select = "view0"+val;
	} else {
		val_select = "view"+val;
	}

	for(var i=1; i < (total+1); i++){
		if(i  < 10){
			target_name = "view0" + i;
		}else{
			target_name = "view" + i;
		}

		if(target_name == val){
			continue;
		}

		if(document.getElementById(target_name) != null){
			document.getElementById(target_name).style.display = 'none';
		}
	}
	
	if(document.getElementById(val_select).style.display != ""){
		document.getElementById(val_select).style.display = '';
	}else{
		document.getElementById(val_select).style.display = 'none';
	}

	return false;
	
}