var item_active;
    var xmlHttp;
    function createXMLHttpRequest() {
	  if (window.ActiveXObject) {
		 xmlHttp = new   ActiveXObject("Microsoft.XMLHTTP");
	  }
	  else if (window.XMLHttpRequest) {
		 xmlHttp = new XMLHttpRequest();
	  }
    } 
	

  function tim2(event){
	var keyCode = event.keyCode;
	if(keyCode==13)
		{
			timkiemfunc2();
		}
	}

	function handleEnter(inField, e) {

		var charCode;
		if(e && e.which){
			charCode = e.which;
		}else if(window.event){
			e = window.event;
			charCode = e.keyCode;
		}
	
		if(charCode == 13) {
			timkiemfunc2();
		}
	}

	
	
	function timkiemfunc2(pos)
	{
		var keyword = document.getElementById("keyword").value;
		if(keyword=="")
		{
			alert("Vui lòng nhập từ khóa!");	
			document.getElementById("keyword").focus();
			return false;
		}
		
		document.location.href="index.php?option=search&keyword="+encodeURI(keyword);
		
		return false;
		 var url="includes/timkiem_ajax.php?pos="+pos+"&keyword="+encodeURI(keyword);
		 url=url + "&sid=" + Math.random();  
		 document.getElementById("ketqua").innerHTML = '<img src="images/loading.gif" width="32"/>Loading...';
		 createXMLHttpRequest();
		 xmlHttp.onreadystatechange = timkiem_handleStateChange;
		 xmlHttp.open("GET",url);	
		 xmlHttp.send(null); 

	}
	
	function timkiem_handleStateChange(){
		if(xmlHttp.readyState == 4) {
		 if(xmlHttp.status == 200){
			
			document.getElementById("ketqua").innerHTML=xmlHttp.responseText;
		 }  
	  }
	}

	function empty()
{
	document.getElementById("keyword").value="";
		
	}