//이미지롤오버
function rollover (obj_img){
	var re = new RegExp('.gif');
	obj_img.src = obj_img.src.replace(re,'_on.gif');
}

function rollout (obj_img){
	var re = new RegExp('_on.gif');
	obj_img.src = obj_img.src.replace(re,'.gif');
}
function layer_view (layer_name, layer_display){
	if (layer_display == "view"){
		document.getElementById(layer_name).style.display = "block" ;
	}else {
		document.getElementById(layer_name).style.display = "none" ;
	}
}