In your code in each dialog you are using

 

if ($AllowCreateFolder!="true")
{
       echo "alert('".GetString("NoPermission")."');";
       echo "return;";
}

The command GetString("NoPermission") is returning a string containing a ' which breaks the alert command.

 

GetString("NoPermission") returns:-

Forbidden. You don't have permission to access this function.

 

You need to slash out the ' in don't.