Hi there Gändälf,
here is thee:) javascript method but bear in mind that, server side validation will still be required....
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script type="text/javascript">
<!--
function checkForFilling() {
if(document.forms[0][0].value=='') {
alert('stop messing about pop\n\nsomething in the box');
return false;
}
return true;
}
//-->
</script>
</head>
<body>
<form action="http://www.google.com" method="get" onsubmit="return checkForFilling()">
<div>
<input type="text" name="foo"/><label> : fill box</label>
<input type="submit" value="submit" />
</div>
</form>
</body>
</html>