[xsl] Urgent-how to select node descent of a node

I have 3 variable:

$beginpath= "/html/body/blockquote"
$tag="div"
$endpath= "/table/tr/td/font"


I try to get some value of nodes at:
/html/body/blockquote/div[1]/table/tr/td/font and
/html/body/blockquote/div[2]/table/tr/td/font
/html/body/blockquote/div[3]/table/tr/td/font

$beginpath/*[name()=$tag][position()=$index]//$endpath

but evidenly it doesnt run.

I don't know how to do. Please help me.Thanks in advance

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