var browser=navigator.userAgent;
var validate=browser.match(/(MSIE)/g);

function DropDown(layer){
if(validate){
DropDownIE(layer);
}
else{

DropDownNS(layer);
}
}

function Hide(layer){
if(validate){
HideIE(layer);
}
else{

HideNS(layer);
}
}
function DropDownIE(layer){

document.all.item(layer).style.visibility="visible";

if(layer=='Layer1'){
document.all.item("Layer2").style.visibility="hidden";
}

if(layer=='Layer11'){
document.all.item("Layer1").style.visibility="visible";
}

if(layer=='Layer2'){
document.all.item("Layer1").style.visibility="hidden";
document.all.item("Layer11").style.visibility="hidden";
}
}

function HideIE(layer){
var show1=document.all.item("Layer1").style.visibility;
var show11=document.all.item("Layer11").style.visibility;

if(show1=='visible' && show11=='visible' && layer=='Layer11' || show1=='visible')
{document.all.item("Layer11").style.visibility='hidden';
document.all.item("Layer1").style.visibility='hidden';}
else
{
document.all.item("Layer1").style.visibility='hidden';
document.all.item("Layer11").style.visibility='hidden';
document.all.item("Layer2").style.visibility='hidden';
}

}

 /// ---------------- Just for NetScape ---------------------- ///
 
 function placement(layer){
 var topCorner=((window.innerWidth)/2)-306;
 
document.Layer1ns.left=topCorner+130;  // 70
document.Layer11ns.left=topCorner+210; // 150
document.Layer2ns.left=topCorner+70; // 130
document.Layer1ns.top=-540; // -407
document.Layer11ns.top=-578; // -445
document.Layer2ns.top=-407; // -540


 }
 
function DropDownNS(layer){
placement(layer);

eval('document.'+layer+'ns.visibility="show"');

if(layer=='Layer1'){
document.Layer2ns.visibility="hide";
}

if(layer=='Layer11'){
document.Layer1ns.visibility="show";
}

if(layer=='Layer2'){
document.Layer1ns.visibility="hide";
document.Layer11ns.visibility="hide";
}
}

function HideNS(layer){

var show1=document.Layer1ns.visibility;
var show11=document.Layer11ns.visibility;

if(show1=='show' && show11=='show' && layer=='Layer11ns' || show1=='show')
{document.Layer11ns.visibility='hide';
document.Layer1ns.visibility='hide';}
else
{
document.Layer1ns.visibility='hide';
document.Layer11ns.visibility='hide';
document.Layer2ns.visibility='hide';
}

}