function ajaxFunction(id){
	setVisibility('concertInfo', 'inline');
	setVisibility('advSearch', 'none');
	
	var ajaxRequest;  // The variable that makes Ajax possible!
	
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				// Something went wrong
				alert("Your browser broke!");
				return false;
			}
		}
	}
	// Create a function that will receive data sent from the server
	ajaxRequest.onreadystatechange = function(){
		if(ajaxRequest.readyState >= 4){
			var ajaxDisplay = document.getElementById('concertInfo');
			ajaxDisplay.innerHTML = ajaxRequest.responseText;
		}  else {
			var ajaxDisplay = document.getElementById('concertInfo');
			ajaxDisplay.innerHTML = "<p>loading...</p>";
		}
	}
	var day = id;
	var queryString = "?day=" + day + "&rand=" + Math.random();
	
	ajaxRequest.open("GET", "/_ajax/ajax.php" + queryString, true);
	ajaxRequest.send(null); 
}