function gup(name)
{
  name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
  var regexS = "[\\?&]"+name+"=([^&#]*)";
  var regex = new RegExp( regexS );
  var results = regex.exec( window.location.href );
  if( results == null )
    return "";
  else
    return results[1];
}   
   
   function makeRequest(url) {
	 
    
    var httpRequest;

        if (window.XMLHttpRequest) { // Mozilla, Safari, ...
            httpRequest = new XMLHttpRequest();
           
            if (httpRequest.overrideMimeType) {
                httpRequest.overrideMimeType('text/xml');
                // See note below about this line    
            }
        } 
      
    
    else if (window.ActiveXObject) { // IE
            try {
                httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
                } 
                catch (e) {
                           try {
                                httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
                               } 
                             catch (e) {}
                          }
                                       }
                                       
     if (!httpRequest) {
            alert('Giving up :( Cannot create an XMLHTTP instance');
            return false;
        }
        httpRequest.onreadystatechange = function() { alertContents(httpRequest); };
    	httpRequest.open('GET', 'php/classGetter.php?p='+gup('p')+'&s='+gup('s'), true);
        httpRequest.send('');
    }
                                  
    function alertContents(httpRequest) {
        if (httpRequest.readyState == 4) {
            if (httpRequest.status == 200) {
          document.getElementById('classList').innerHTML = '<b><h4>Classes This Instructor Teaches</h4></b><br />'+httpRequest.responseText;
      //alert(httpRequest.responseText);
            } else {
                alert('There was a problem with the request.');
            }
        }

    }