function getPage(p,c) {
    var xmlHttp;
    try {
      // Firefox, Opera 8.0+, Safari
      xmlHttp = new XMLHttpRequest();
    }
    catch (e) {
      // Internet Explorer
      try {
        xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
      }
      catch (e) {
        try {
          xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch (e) {
          alert("Your browser does not support AJAX!");
          return false;
        }
      }
    }
    xmlHttp.onreadystatechange = function setPage() {
        if(xmlHttp.readyState == 4) {
          document.getElementById('containerL').innerHTML = xmlHttp.responseText;
        }
    }
    if(c != "" && c != null) {
        xmlHttp.open("GET","model.php?pID="+p+"&cID="+c,true);
        xmlHttp.send(null);
    } else {
        xmlHttp.open("GET","model.php?pID="+p,true);
        xmlHttp.send(null);
    }
    
}