// JavaScript Document
function btn_attach_effect(btn_name, obj_effect, image_over_src, image_out_src){
	var btn_name = document.getElementById(btn_name);
	var obj_effect = document.getElementById(obj_effect);
	
	if(btn_name.className != "active"){
		obj_effect.onmouseover = function(){
				btn_name.style.background = 'transparent url(' + image_over_src + ') no-repeat top center';
		}
		
		obj_effect.onmouseout = function(){
				btn_name.style.background = 'transparent url(' + image_out_src + ') no-repeat top center';
		}
	}
}