function navigate()
{
    var sel_nav;
   sel_nav=parseInt(document.getElementById("hid").value);

   switch(sel_nav)
   {
        case 0:
            document.getElementById("home").className="selected";
            break;
        case 1:
            document.getElementById("converter").className="selected";
            break;
        case 2:
            document.getElementById("commodities").className="selected";
            break;
        case 3:
            document.getElementById("job").className="selected";
            break;
        case 4:
            document.getElementById("products").className="selected";
            break;
   }
}