// JavaScript Document
var xmlHttp;
function checkAndShow() {
	var visitdate=document.visitForm.strVisitDate.value;
	var gradyr=document.visitForm.strGraduation.value;
	if(visitdate&&gradyr) showVisitActivities(visitdate,gradyr);
	else {document.getElementById("activities").innerHTML='<i>Please select your graduation year and desired visit date to see what activities are available</i>';}
}

function showVisitActivities(visitdate,gradyr){ 
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null){
 	 	alert ("Browser does not support HTTP Request")
		return
 	}
	url="visit_activities.php";
	url=url+"?date="+visitdate+"&gradyr="+gradyr;
	xmlHttp.onreadystatechange=stateChanged ;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);

}

function stateChanged() { 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") { 
	 document.getElementById("activities").innerHTML=xmlHttp.responseText ;
	//document.getElementById("activities").innerHTML=url; //testing
	
	
	} 
}

function GetXmlHttpObject(){
	var xmlHttp=null;
	try
 	{
	 // Firefox, Opera 8.0+, Safari
	 xmlHttp=new XMLHttpRequest();
	 }
	catch (e)
	 {
	 //Internet Explorer
	 try
	  {
	  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
	  }
	 catch (e)
	  {
	  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	  }
	 }
	return xmlHttp;
}