function getid(idname){
return document.getelementbyid(idname);
}
/*------------------------------tab选择效果------------------------*/
function settab(name,cursel,n){
	for(var i=1;i<=n;i++){
		var menu=document.getelementbyid(name+i);
		var con=document.getelementbyid("con_"+name+"_"+i);
		menu.classname=i==cursel?"info":"";
		con.style.display=i==cursel?"block":"none";
 	}
}
/*------------------------------tab栏鼠标移动图片时效果------------------------*/
function hdtab(){
	
}

/*------------------------------首页下拉菜单------------------------*/
function hdnav(){
	var navlen=getid("nav-link").getelementsbytagname("li");
	for (var i=2;i<=navlen.length ;i++ )
	{
        getid("nav-link-"+i).classname=" ";
		getid("sub-nav-"+i).style.display="none";
	}
}
function shownav(num){
	hdnav();
	getid("sub-nav-"+num).style.display="block";
    getid("nav-link-"+num).classname="now-nav";
}