function shwblck(el) 
{ 
InptEl = document.getElementById(el);
if (InptEl.style.display == "none" || InptEl.style.display=="") {
    for (i = 1; i < 3; i++) {
document.getElementById("npt"+i).style.display = "none";
document.getElementById("npt"+i+"bg").style.backgroundColor = "#6e7e8d";
    }
InptEl.style.display = "block";
document.getElementById(el+"bg").style.backgroundColor = "#f0f0f0";
    }
}