function checkCode()
{	
	var obj = document.getElementById("code")
	var str = obj.value;
	if (str.length==0)
	{ 
		document.getElementById("txtHint").innerHTML="";
		return;
	}
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
		alert ("Your browser does not support AJAX!");
		return;
	} 
	var url="check.php";
	url=url+"?code="+str;
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}


function stateChanged() 
{ 
	var obj = document.getElementById("code")
	var str = obj.value;	
	if (xmlHttp.readyState==4)
	{ 
		//document.getElementById("txtHint").innerHTML = xmlHttp.responseText;
		if (xmlHttp.responseText=="true")
		{
			document.getElementById("txtHint").className = "code_correct";
			document.getElementById("preturi").className = "preturi_reduse";
			document.getElementById("Cod").value = str;
			document.getElementById("Codul").value = str;
			
		}
		else
		{
			document.getElementById("txtHint").className = "code_incorrect";
			document.getElementById("preturi").className = "preturi_full";
			document.getElementById("Cod").value = "";
			document.getElementById("Codul").value = "";			
		}
	}
}


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;
}