Running javascript via an aspx.vb file

[Stegmite]

I'm developing with Visual Studio, and have little training in JavaScript. I'm trying to run a premade series of scripts that allow you to have a "shopping cart" without a database to store the orders, using cookies. All in all I'm trying to put this:

<FORM NAME=order ACTION="managecart.html" onSubmit="AddToCart(this);">
      Quantity: <input type=text size=2 maxlength=3 name=QUANTITY onChange='this.value=CKquantity(this.value)' value="1">
      <input type="image" src="./images/buynow.gif" border=0 value="Add to Cart" align=top>
      <input type=hidden name=PRICE value="59.95">
      <input type=hidden name=NAME value="Thanksgiving Pumpkin Pack">
      <input type=hidden name=ID_NUM value="FPP1">

      <input type=hidden name=SHIPPING value="14.95">
      </FORM>

into a datagrid's selected index value changed. Can someone shed some light for me?