XML attributes NaN

Hey all,
I am having a weird issue with my XML

I have an xml file, the area with the issue is setup similar to :
<thumbLayout rows=“1” cols=“0” number=“1” offset=“0” thumbnailWidth=“77” thumbnailHeight=“39” />

I am taking these values in flash with the XPath class. The problem that I am having is that I need these variables to return as numbers so that I can build a table. They trace out fine but for some reason I can’t use them as numbers. Has this happened to anyone?