function changeSize(size)
{
    document.getElementById("tconetnt").style.fontSize=size;
    var list=document.getElementById("tconetnt").getElementsByTagName("p");
    for (var i = 0; i < list.length; i++) 
    {
        var p=list[i];
        p.style.fontSize=size;
    }
}


function changehealth(obj)
{
    document.getElementById("technology").style.display="none";
    document.getElementById("attention").style.display="none";
    document.getElementById("doctor").style.display="none";
    document.getElementById(obj).style.display="block";
}

function changeyy(obj)
{
    document.getElementById("shehui").style.display="none";
    document.getElementById("yunchan").style.display="none";
    document.getElementById("yousheng").style.display="none";
    document.getElementById(obj).style.display="block";
}


function changeMiddle(obj1,obj2)
{
    document.getElementById(obj1).style.display="none";
    document.getElementById(obj2).style.display="none";
    document.getElementById(obj1).style.display="block";
}