var xmlHttp
var grade = 0;
var mediaid = 0;

function gradeMedia(grade, mediaid, catid)
{
    xmlHttp=GetXmlHttpObject()
	
	if (xmlHttp==null)
	{
		  alert ("Your browser does not support AJAX!");
		  return;
	}
	
    this.grade = grade;
    this.mediaid = mediaid;
       
	var url="grade.php";
	url=url+"?MediaID="+mediaid;
	url=url+"&grade="+grade;
	url=url+"&CategoryID="+catid;
	url=url+"&sid="+Math.random();
    
    
    
	xmlHttp.onreadystatechange=stateChanged;
	
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function editGrade(grade, gradeid)
{
    xmlHttp=GetXmlHttpObject()
    
    if (xmlHttp==null)
    {
          alert ("Your browser does not support AJAX!");
          return;
    }
    
    this.grade = grade;
    this.gradeid = gradeid;
       
    var url="grade.php?edit=true";
    url=url+"&GradeID="+gradeid;
    url=url+"&grade="+grade;
    url=url+"&sid="+Math.random();
    
    xmlHttp.onreadystatechange=stateChanged;
    
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
} 

function stateChanged() 
{ 
	if (xmlHttp.readyState==4)
	{ 
        if(xmlHttp.responseText == "Stored") {
            document.getElementById("voted"+mediaid).style.width=(grade * 20)+'%';
        }
        else if(xmlHttp.responseText == "Updated") {
            document.getElementById("editedGrade").style.width=(grade * 20)+'%';
            
            newText = document.createTextNode("Your grade has been changed successfully");
            document.getElementById("gradeEditedMsg").appendChild(newText);
            
            for (i = 1; i <= 5; i++) {
                document.getElementById("vote"+i).style.display='none';
            }
        }
        else {
            alert("Error:"+xmlHttp.responseText);
        }
	}
}

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;
}