// ���C���[����


var id = new Array( "Layer1", "Layer2", "Layer3", "Layer4" );

function showInfo( num ){
	var obj;
	if( document.all )
		obj = document.all(id[num-1]).style;
	else if( document.getElementById )
		obj = document.getElementById(id[num-1]).style;
	
	if( obj ){
		if( obj.display == 'none' ){
			dispNoneAll();
			obj.display = '';
		}
	}
}

function dispNoneAll(){
	for(var i=1; i<=id.length; i++){
		if( document.all )
			document.all(id[i-1]).style.display = 'none';
		else if( document.getElementById )
			document.getElementById(id[i-1]).style.display = 'none';
	}
}