Justin A.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script type="text/javascript">
function checkFields()
{
        var latData = document.dataSubmission.Latitude.value ;
        var longData = document.dataSubmission.Longitude.value;
        var dataForm = document.dataSubmission;
        var errorRegion = document.getElementById('errorRegion');
        //Could be any form of selection

        //Checks the form data to determine if its blank
        if((latData == "") || (longData == ""))
        {

                errorRegion.style.visibility = "visible";

        }
        else
        {

                errorRegion.style.visibility = "hidden";
                dataForm.submit();  //Allows us to submit data
        }
}
</script>

</head>

<body>

<!-- An example of this form data!  -->
<form name="dataSubmission" method="post" action="http://someurl.com>
        Latitude<input type="text" name="Latitude"  /><br /><br />
    Longitude<input type="text" name="Longitude"  />
    <input type="button" value="Submit" name="Submit" onclick="checkFields()" />
</form>
<div id="errorRegion" style="visibility:hidden; width:300px; height:100px;">
Error!</div>


</body>


</html>