var url=location.href.toLowerCase();

if(url.indexOf("about")!=-1||url.indexOf("honor")!=-1)
{
document.getElementById("nav2").className="active dropdown";
}
else if(url.indexOf("equipment")!=-1)
{
document.getElementById("nav3").className="active dropdown";
}
else if(url.indexOf("product")!=-1)
{
document.getElementById("nav4").className="active dropdown";
}
else if(url.indexOf("case")!=-1)
{
document.getElementById("nav5").className="active dropdown";
}
else if(url.indexOf("news")!=-1)
{
document.getElementById("nav6").className="active dropdown";
}
else if(url.indexOf("contact")!=-1)
{
document.getElementById("nav7").className="active  dropdown";
}
else{
document.getElementById("nav1").className="active";
}