function ShowSub(menu)
{
 var el1 =document.getElementById("LNKDD1");
 var el2 =document.getElementById("LNKDD2");
 var el3 =document.getElementById("LNKDD3");
 var el4 =document.getElementById("LNKDD4");

		if( menu=="LNK1" )
 	 	{

   	    el1.style.visibility = "visible";
   	    el1.style.display = "block";
		el2.style.visibility = "hidden";
        el2.style.display = "none";
		el3.style.visibility = "hidden";
   	    el3.style.display = "none";
		el4.style.visibility = "hidden";
   	    el4.style.display = "none";
 	 	}
		else if( menu=="LNK2" )
		{

		el1.style.visibility = "hidden";
   		el1.style.display = "none";
	    el2.style.visibility = "visible";
   		el2.style.display = "block";
		el3.style.visibility = "hidden";
   		el3.style.display = "none";
		el4.style.visibility = "hidden";
   		el4.style.display = "none";
 	 	}
		else if( menu=="LNK3" )
		{

		el1.style.visibility = "hidden";
   		el1.style.display = "none";
		el2.style.visibility = "hidden";
   		el2.style.display = "none";
		el3.style.visibility = "visible";
   		el3.style.display = "block";
		el4.style.visibility = "hidden";
   		el4.style.display = "none";
 	 	}
		else if( menu=="LNK4" )
		{
		
		el1.style.visibility = "hidden";
   		el1.style.display = "none";
		el2.style.visibility = "hidden";
   		el2.style.display = "none";
		el3.style.visibility = "hidden";
   		el3.style.display = "none";
		el4.style.visibility = "visible";
   		el4.style.display = "block";
 	 	}
		else
		{
		el1.style.visibility = "hidden";
   		el1.style.display = "none";
		el2.style.visibility = "hidden";
   		el2.style.display = "none";
	    el3.style.visibility = "hidden";
   		el3.style.display = "none";
		el4.style.visibility = "hidden";
   		el4.style.display = "none";
		}
}