function formValidation() {
    var customername = document.getElementById("cust_name").value;
    var mobilenumber = document.getElementById("cust_mobile").value;
    var location1name = document.getElementById("loc1_name").value;
    var location1address = document.getElementById("loc1_address").value;
    if (customername == "") {
        alert("Please provide your name");
        document.getElementById("cust_name").focus();
        return false;
    }
    else if (mobilenumber == "") {
        alert("Please provide your mobile telephone number");
        document.getElementById("cust_mobile").focus();
        return false;
    }
    else if (location1name == "") {
        alert("Please provide at least 1 location name");
        document.getElementById("loc1_name").focus();
        return false;
    }
    else if (location1address == "") {
        alert("Please provide at least 1 location address");
        document.getElementById("loc1_address").focus();
        return false;
    }
    else {return true};
}