var downloadurl = '/eproweb/download.php';

function protectedDownload( blockId ){
    var password = prompt("Bitte Passwort eingeben", "");

	if (password != "" && password != null){
		new Ajax.Request(downloadurl, {
			method: "post",
			parameters: "block="+blockId+"&pw="+password,
			onSuccess: function(response) {
				if(response.responseText == "200"){
					top.location.href = downloadurl + "?block="+blockId;
				}
				else{
					alert("Das Passwort ist leider falsch");
				}
			}
		});
	}
}