Addition/Subtraction of numbers.

Hi ,

	I am trying to add numbers present in two variables like

<xsl:variable name="temp1" select="$t1 + $t2" />

if varaibles t1 , t2 have some numbers, it goes through fine. 
But if they are null  NaN is comming in the output.
is there a way I can convert these variables to numbers 
before adding them(null should be converted to zero) or
Is there any other way to handle this condition.

Thanks,
Raj..

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