how do I place a check about a particular html tag?

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MS-Excel

VBA

Assume this web link:
http://worldwide.espacenet.com/publicationDetails/biblio?DB=EPODOC&II=0&ND=3&adjacent=true&locale=en_EP&FT=D&date=19950620&CC=US&NR=5425515A&KC=A

I need to fetch data from many such links. I have almost completed writing the code but facing a small problem. If you open the web page, there is some data (patent numbers) corresponding to "Also published as:" title. I need to copy those patent numbers and paste it in excel. The problem is, sometimes the title "Also published as:" does not exist and in that case I need to keep the cell blank. How do I place a check that whether the "Also published as:" exists in the web page or not?

The code:

num3 = ActiveSheet.UsedRange.Rows.Count
For num2 = 2 To num3
ie1.Visible = True
ie1.navigate Range("T" & num2).Value
Do
DoEvents
Loop Until ie1.readyState = READYSTATE_COMPLETE
Set doc1 = ie1.document
dd1 = Trim(doc1.getElementsByTagName("th")(8).innerText)
If InStr(dd1, "published") Then
sdd1 = Trim(doc1.getElementsByTagName("td")(9).innerText)
Range("B" & num2).Value = sdd1
Else
Range("B" & num2).Value = ""
End If
Next num2
ie1.Quit

Column T contains the web links to be accessed 9th tag contains the text "Also published as:" 10th tag contains the data (patent numbers) to be fetched

Please help