submit doesn't pass selected rows with form

I have a grid place in a form, and when i select a row and click submit, the row info isn’t passed to the server. I’ve been looking at dhtmlxgrid_form.js (which I found separately on this forum as it wasn’t included in the free version), and I can see where it is failing:

On line 183, it calls createFormInputRow w/ each selected row:
this.createFormInputRow(this.selectedRows[i]);

But, in createFormInputRow, the value passed through is undefined, which I discovered by putting an alert® inside the for loop.

Here’s the html i’m using for the grid and surrounding page:

<?xml version="1.0" encoding="iso-8859-1"?> SMARTS Device Tools <!--/* <![CDATA[ */
h1 {
    font-family:verdana;
}

textarea, input {
    font-family: Arial;
    font-size:small
}

input.stdwidth, textarea.stdwidth {
    width: 350px
}

body, table, tr, td {
    vertical-align: middle;
    font-family:verdana;
    font-size: 0.9em;
}

select {
    width:350px;
}

#srch_crit {
    width: 700px;
    margin-left: auto;
    margin-right: auto;
    padding: 0em;
}

#gridbox {
width:700px; 
height:400px;
    margin-left: auto;
    margin-right: auto;
    padding: 0em;
}

#srchActions {
    width: 550px;
    margin-left: auto;
    margin-right: auto;
    padding: 0em;
}

/* ]]> */–>

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dhtmlxgrid_form.js is included at Standad library. You can download it here dhtmlx.com/docs/download.shtml

I have downloaded dhtmlxgrid_form.js. That’s where the problem is.

thx.