function showhide(val) 
{ 
var ge1=document.getElementById('d1'); 
var ge2=document.getElementById('d2'); 
if(val==0) 
{ 
ge1.style.display="block"; 
ge2.style.display="none"; 
} 
else 
{ 
ge1.style.display="none"; 
ge2.style.display="block"; 
} 
}