//导航选项卡
/*更换显示样式*/
function setTab(m,n){
	var tli = document.getElementById("menu"+m).getElementsByTagName("li");
	var mli = document.getElementById("main"+m).getElementsByTagName("ul");
	
	var faterLfet = document.getElementById("tabs1").offsetLeft;	//得到父div到浏览器左边的距离
	var titleWidth = tli[1].clientWidth;							//得到一级菜单的宽度
	var titleLeft = titleWidth * n;									//得到第n个一级菜单到父div左边的距离
	var left = faterLfet + titleLeft;								//计算第n个一级菜单到浏览器左边的距离		
	var oneMenuMiddle = left - titleWidth / 2;						//得到一级菜单重点与浏览器左边的距离
	
	for(i=0;i<tli.length;i++){
	   tli[i].className=i==n?"hover":"";
	   mli[i].style.display=i==n?"block":"none";
	   var tabs1Num = mli[n].clientWidth; 							//获取二级菜单的宽度
	   if(n == 0){
	   	  var twoLeft = oneMenuMiddle - tabs1Num / 2;				//得到二级菜单与浏览器左边的距离
	   }else{
	   	  var twoLeft = oneMenuMiddle - tabs1Num / 2 -180;			//得到二级菜单与浏览器左边的距离
	   }
	   document.getElementById("fatherDiv").style.left = twoLeft;
	}
}