click on table span javascript

[Smat90]

Hi evrybody, I'am new user and I need your help
for frist sorry for my English

I would like to write a.script for copy some data from a table on this website: Euro area yield curve

The table is not immediatly visible, I must click on the word "Yields" that is on top-right of diagram, and so will appare the table.

I tried to write a vbascript for open the table but it does not work.
Can you help me please??

Below attach part of my code:

Private Sub CommandButton1_Click()


Dim termine As String
Dim tasso As String


termine = ""
tasso = ""


the_start:

Set objIE = CreateObject("internetExplorer.Application")
objIE.Top = 0
objIE.Left = 0
objIE.Width = 800
objIE.Height = 600
objIE.Visible = True 'vediamo la finestra

On Error Resume Next

objIE.navigate ("http://www.ecb.europa.eu/stats/money/yc/html/index.en.html")

Do
DoEvents

If Err.Number <> 0 Then
objIE.Quit
Set objIE = Nothing
GoTo the_start

End If


Loop Until objIE.ReadyState = 4


IE.document.all.item
Call IE.document.parentWindow.execScript("javascript:charts[0].switchDimension(1,1);", "JavaScript")

Thanks