switch($_GET["ID"]) { 
        case "2": { 
            require("aboutus.php"); 
        } break; 
    }

    switch($_GET["ID"]) { 
        case "3": { 
            require("reffer.php"); 
        } break; 
    }

    switch($_GET["ID"]) { 
        case "4": { 
            require("project.php"); 
        } break; 
    }

    switch($_GET["ID"]) { 
        case "5": { 
            require("products.php"); 
        } break; 
    }

    switch($_GET["ID"]) { 
        case "6": { 
            require("contact.php"); 
        } break; 
    }