// JavaScript Document
/*
*
* Function : menu controlle
*
*/
function show_hide(x, y){
	a = document.getElementById(x);
	b = document.getElementById(y);
	if(d.style.display = "none") {
		a.src = "/images/common/arrow_on.gif";
		d.style.display = "";
	} else {
		a.src = "/images/common/arrow_off.gif";
		d.style.display = "none";
	}
}
/* 头部的鼠标经过效果css实现后可以去掉*/
function change_image(_this,x){
	_this.src=x;
}