function changeBg(mm)
{

    if(document.getElementById(mm.id).className=="menubg")
    {
    document.getElementById(mm.id).className="menubg2";
    }
    else
    {
    document.getElementById(mm.id).className="menubg";
    }
    
}

function chkPicSize(pic)
{

   var gpic=document.getElementById(pic);

    if(gpic.width>400)
    {
        gpic.style.width=400;
    }
}

function chkp(p)
{
    document.getElementById("p1").style.display="none";
    document.getElementById("p2").style.display="none";
     document.getElementById(p).style.display="";

    
}