function selectSignupLevel(url, type_id) {	
	 try {
        ajax = new ActiveXObject("Microsoft.XMLHTTP");
     } 
     catch(e) {
        try {
           ajax = new ActiveXObject("Msxml2.XMLHTTP");
        }
     catch(ex) {
           try {
              ajax = new XMLHttpRequest();
           }
        	catch(exc) {
              alert("This browser doesn't support Ajax requests");
              ajax = null;
           }
        }
     }   

	if(ajax) {            	 
	 
	 var show_levels = document.getElementById("show_levels");	 
	 show_levels.style.display = "none";
	  
	 ajax.open("GET", url+"/selectSignupLevel.php?listingtype="+type_id, true);
	 ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	 
	 ajax.onreadystatechange = function() { 	 	
		if(ajax.readyState == 4 ) {                  	          	
		  	 if(ajax.responseText) {
		  	    processXML(ajax.responseText);
		  	 }
		   	else {			
		   	   show_levels.style.display = "none";			  
		   	}
           }
        }         
	    var params = "listingtype="+type_id;
	    	    
        ajax.send(null);
   }      
}
  
function processXML(obj){   
	  var show_levels = document.getElementById("show_levels");
      show_levels.style.display = "block";
      show_levels.innerHTML = obj;   
}