function check()
{
    if(document.getElementById("first_name").value=="")
    {
        alert("Please enter first name!!");
        document.getElementById("first_name").focus();
        return false;
    }
    else
    {
        if(document.getElementById("rooms").value=="")
        {
            alert("Please enter last name!!");
            document.getElementById("rooms").focus();
            return false;
        }   
        else
        {
            if(document.getElementById("nights").value=="")
            {
                alert("Please enter total nights!!");
                document.getElementById("nights").focus();
                return false;
            }   
            else
            {
                if(document.getElementById("room2").value=="")
                {
                    alert("Please enter total rooms!!");
                    document.getElementById("room2").focus();
                    return false;
                }   
                else
                {
                    if(document.getElementById("adult").value=="")
                    {
                        alert("Please enter total number of adults!!");
                        document.getElementById("adult").focus();
                        return false;
                    }   
                    else
                    {
                        if(document.getElementById("chield").value=="")
                        {   
                            alert("Please enter total number of chield!!");
                            document.getElementById("chield").focus();
                            return false;
                        }   
                        else
                        {
                            if(document.getElementById("emailid").value=="")
                            {   
                                alert("Please enter email id!!");
                                document.getElementById("emailid").focus();
                                return false;
                            }   
                            else
                            {
                                return true;
                            }
                        }
                    }
                }
            }
        }
    }
}