function validUser(){
	var user=document.getElementById('username').value;
	var pass=document.getElementById('password').value;
	var url = 'login.php';
	var ajax_req = new Ajax.Request(
	url,
	{
		method: 'post',
		parameters: {username: user,password: pass},		
		onLoading: showLoading,
		onComplete: showResults
	});

	}
		
function showLoading(){
	document.getElementById('login').innerHTML='<img src=\"../images/progress.gif\">';
}

function showResults(resp){
	resp = resp.responseText;
	if(resp=='success'){
		location.reload(true);
	}else{
		document.getElementById('login').innerHTML=resp;
	}
		
}

function update_poll(questionValue){
	var selectedAns;
	var answers = document.getElementsByName('answers');
	var i;
	for(i = 0; i < answers.length; i++){
		if(answers[i].checked){
		selectedAns=answers[i].value;
		}
	}			
	var ajax_req = new Ajax.Request(
	'poll.php',
	{
		method : 'post',
		parameters: {answers: selectedAns,question_id: questionValue},
		onComplete: show_poll_results
	}) ;
}
		
function show_poll_results(resp){
	resp = resp.responseText ;
	document.getElementById('poll').innerHTML = resp;
}