Getting the position of a node into a variable

Hi Guys,

I need to determine the position of a node in a document so that I can read out it's sibilings that follow it.
More specifically, I'm implementing breadcrumbs (eg such as home --> Internet Plans--> Cable --> Monthly), but I need to start the breadcrumbs at a specific parent beign the root. I want to start the breadcrumbs at "Internet Plans".
So I'd like to determine the position of "Internet Plans" in /document/parent so I can then loop through the parents with a <xsl:for-each select="/document/parent/document[position() >= 1]">
However, I can't seem to get the position of the desired node in any way that I've tried.

for example, the following don't work:

<xsl:variable name="breadcrumb_start" select="/document/parent/document[name="Internet Plans"]/position()>

<xsl:variable name="breadcrumb_start" select="position(/document/parent/document[name="Internet Plans"])>

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<document>
  <parent>
    <document>
      <name>Home</name>
    </document>
    <document>
      <name>Internet Plans</name>
    </document>
    <document>
      <name>Wireless</name>
    </document>
  </parent>
</document>