return/enter key with forms

The problem is: Stopping the user from pressing the return key in an empty 
text box.
I tried using javascript on the input field but it seems that the form is 
being activated as soon as the return key is pressed. Thus an ODBC error 
because a query executes with a blank sql statement.

Any suggestions?

This is the script I am using ....

function checkfornull(field){
                           var checkField = field.value
                           if (checkField == "") {
                           alert ("Please enter a value")
                           field.value = ""
                           field.focus()
                           return false
                           }
                           return true
                           }

Thanks in advance,
Susan
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