function tabbed_pages(){
	var e, i = 0;	
	//gallery选项卡切换
	if (document.getElementById('gallery')){
		while (e = document.getElementById('gallery').getElementsByTagName ('div') [i++]) {
			if (e.className == 'on' || e.className == 'off'){			
			if (i==1) {e.className='on';}//初始化第一个元素	
			e.onmouseover = function () {
				var getEls = document.getElementById('gallery').getElementsByTagName ('div');
					for (var z=0; z<getEls.length; z++) {
					getEls[z].className=getEls[z].className.replace('show', 'hide');
					getEls[z].className=getEls[z].className.replace('on', 'off');
					}
				this.className = 'on';
				var max = this.getAttribute('title');
				if(max) document.getElementById(max).className = "show";
				}
			}
		}
	}
	//mainmenu切换
	if (document.getElementById('mainmenu')){
		//还原变量
		e=0;
		i=0;		
		while (e = document.getElementById('mainmenu').getElementsByTagName ('div') [i++]) {		
			if (e.className == 'on' || e.className == 'off'){
			if (i==1) {e.className='on';}//初始化第一个元素	
			e.onmouseover = function () {
				var getEls = document.getElementById('mainmenu').getElementsByTagName ('div');
					for (var z=0; z<getEls.length; z++) {
					getEls[z].className=getEls[z].className.replace('show', 'hide');
					getEls[z].className=getEls[z].className.replace('on', 'off');
					}
				this.className = 'on';
				var max = this.getAttribute('title');
				if(max) document.getElementById(max).className = "submenu show";//子菜单样式
				}
			}
		}
	}
}