function displayUsers() {
	var input = $('userinput');
	var res = $('usersearch');
	if (input.value != '') {
		var xhr = null;
		if (window.XMLHttpRequest) xhr = new XMLHttpRequest();
		else if (window.ActiveXObject) xhr = new ActiveXObject('Microsoft.XMLHTTP');
		else return false;
		var str = 'search='+input.value;
		xhr.open('POST', './pmsgsearchuser.php', false);
		xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
		xhr.send(str);
		if(xhr.readyState == 4) {
			res.style.display = 'block';
			res.innerHTML = xhr.responseText;
		}
	} else {
		res.style.display = 'none';
		res.value = '';
	}
}