// JavaScript Document
var curChoice="";

function setVisible (choice){
document.getElementById(choice).style.visibility = 'visible';
if (curChoice != ""){
	if (curChoice != choice){
	document.getElementById(curChoice).style.visibility = 'hidden';
	}
	}else{
	document.getElementById('ques1').style.visibility = 'hidden';
	}
curChoice=choice;
};