the code is looking for a button named "eCart1_Checkout", but your checkout button is named "eCart_Checkout"
change:
<input type="submit" name="eCart_Checkout" id="eCart_Checkout" value="Checkout" class="ImpressionsInspiration22" />
to:
<input type="submit" name="eCart1_Checkout" id="eCart1_Checkout" value="Checkout" class="ImpressionsInspiration22" />