Invalid Argument / setZoom problem

[Ice]

Good Day

I've got a geolocation page that will load a predefined address, co-ordinates and zoom level. I also have a reset button
on the page which goes to a default location and zooms out. My problem is that after I click reset and then
click the find button again I get the error "Invalid Argument" in Internet Explorer 8 also I see that if I remove
the setZoom from my GeoAddress function the error is gone. Thing is I need to set the zoom to that level.

Would appreciate any help

Thanks

You may view my code here
http://www.sleeping-out.co.za/testlink.htm