function show_jz(x) {		
	var jz_container = document.getElementById("jz_pics_container") ;
	var lis = jz_container.getElementsByTagName('li');
	var max_screen = Math.ceil(lis.length / 7) ;
	if (x < 1) {
		x = max_screen;
	}
	if (x > max_screen) {
		x  = 1;
	}
	for (i=0;i<7;i++) {
	
		var hidden_cnt = (jz_cur_screen-1)*7+i ;
		var display_cnt = (x-1)*7+i ;
	
		if (hidden_cnt < lis.length) {
			lis[hidden_cnt].style.display = "none" ; //隐藏前面显示的
		}
		if (display_cnt < lis.length) {
			lis[display_cnt].style.display = "block" ; //显示当前
			document.getElementById("jz_img_"+display_cnt).src = jz_imgs[display_cnt] ;
		}
	}
	jz_cur_screen = x ;
	return false ;
}