function Download(id){
	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() {
		if(xmlHttp.readyState==4){
			var vhReturn = xmlHttp.responseText;
			document.getElementById('download').innerHTML= vhReturn;
			return true;
		}else{
			  document.getElementById('download').innerHTML= '<img src="loading.gif"><br>Đang tải dữ liệu';			  
		}
	}
	var security_code = encodeURI(document.getElementById('security_code').value);
	var request	= "id="+id+"&security_code="+security_code+"&check=OK";	
	xmlHttp.open("POST", "download.php", true);
	xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xmlHttp.send(request);
}

function delCodeDownload(){
	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() {
		if(xmlHttp.readyState==4){
			//var vhReturn = xmlHttp.responseText;
			//document.getElementById('download').innerHTML= vhReturn;
			return true;
		}else{
			 // document.getElementById('download').innerHTML= '<img src="loading.gif"><br>Đang tải dữ liệu';			  
		}
	}
	var request	= "check=OK";		
	xmlHttp.open("POST", "delCodeDownload.php", true);
	xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xmlHttp.send(request);
}


function windowOpen(id,security_code){
	var left = (screen.width-300)/2;
	var top  = (screen.height-200)/2;
	window.open('dl.php?id='+id+'&security_code='+security_code+'','quanghoa','location=1,width=400,height=200,left='+left+',top='+top+'');	
}