function welcomeshowxia(divid,i)
{
    var n1=document.getElementById("n5");
    var n2=document.getElementById("n6");
    var n3=document.getElementById("n7");
    
    n1.style.display="none";
    n2.style.display="none";
    n3.style.display="none";
    
    var divid=document.getElementById(divid);
    divid.style.display = "block";
    
    var img_d1=document.getElementById("img_15");
    var img_d2=document.getElementById("img_17");
    var img_d3=document.getElementById("img_19");
    img_d1.src = "images/index_menu_15.jpg";
    img_d2.src = "images/index_menu_17.jpg";
    img_d3.src = "images/index_menu_19.jpg";
    
    var img = document.getElementById("img_"+i);
    img.src = 'images/index_menu1_'+i+'.jpg';
   
    
}