Forms Data Controls :: Conditional GridView Mouseover - Mouseout Template Field?

This is what I have - it works:
<asp:GridView ID="GridView10" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource10"
<asp:TemplateField HeaderText="File Photo" SortExpression="Pic_Number">
<ItemTemplate>
<asp:Image ID="Image1" runat="server" ImageUrl='<%# (Eval("Pic_Number", "http://.../images/{0}.jpg")) %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Item_Count" HeaderText="Stock" SortExpression="Item_Count" InsertVisible="False" ReadOnly="True" >

Conceptually what I want: (item count is a BoundField called in the GridView )

<asp:GridView ID="GridView10" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource10"
<asp:TemplateField HeaderText="File Photo" SortExpression="Pic_Number">
<ItemTemplate>
( IF "Item_Count" > 50 )
<asp:Image ID="Image1" runat="server" ImageUrl='<%# (Eval("Pic_Number", "http://.../images/{0}.jpg")) %>' />
( IF "Item_Count" < 50 )
onmouseout : <asp:Image ID="Image1" runat="server" ImageUrl='<%# (Eval("Pic_Number", "http://.../images/StockLow.jpg")) %>' />
onmouseover: <asp:Image ID="Image1" runat="server" ImageUrl='<%# (Eval("Pic_Number", "http://.../images/{0}.jpg")) %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Item_Count" HeaderText="Stock" SortExpression="Item_Count" InsertVisible="False" ReadOnly="True" >