I've got a Javascript form in which a user inputs a previous address, city, and condition. If this form is posted, I would like the address to become latitude and longitude, and also to store individuals two values to some database. Any help whatsoever is greatly appreciated!

You should use the Google Maps API v3, example:

//get the input from user, in a normal looking address string
var add = this.ListingAddress + ', ' + this.ListingCity + ', ' + this.ListingZipCode;

var geocoder = new google.maps.Geocoder();
geocoder.geocode({ 'address': add }, function(results, status) {
    if (status == google.maps.GeocoderStatus.OK) {
        var LatLong = results[0].geometry.location; //here is the LatLong
    } else {
        alert("Address not found! Error Code: " + status);
    }
});