function exp_coll_ques(id)
{
	ans = document.getElementById(id + "_ques");
	if (ans.style.display == 'none')
	{
		ans.style.display = 'block';
	}
	else if (ans.style.display == 'block')
	{
		ans.style.display = 'none';
	}
}

function exp_ques(id)
{
	exp_ans = document.getElementById(id + "_ques");
	if (!(exp_ans)) 
		return false;
	exp_ans.style.display = 'block';
}

function coll_ques(id)
{
	coll_ans = document.getElementById(id + "_ques");
	if (!(coll_ans)) 
		return false;
	coll_ans.style.display = 'none';
}

function coll_all_ques()
{
	coll_ques("UPS");
	coll_ques("PC");
	coll_ques("HV");
	coll_ques("TAT");
}