Mouse over enlarge image problems

Mouse over enlarge image problems

Hi I am building a banknote site and want a page that shows a list of banknotes in a thumbnail list and further info on the right. i want the customer to be able to mouse over the image and this enlarges the same as used on ebay. I did have a thumbnail that when I use a mouse over effect on the larger image in a frame set up crushed all the other info on the page and looked terrible. I have tried to use jquey via a dummies book which tells me to download from jquery site but this message comes up
 

Windows Script Host

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Script:   C:\Users\Gary\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\L3OWT659\jquery-1.4.min.js

Line:      16

Char:     1

Error:     'window' is undefined

Code:    800A1391

Source:                 Microsoft JScript runtime error
 
Can someone please help by either
Telling me how to use the code used on e-bay
or, how to fix the mouse over problem when using larger images in a table
or, how to download jquery so i do not get the above error
many thanks for your time it is very much appreciated Gary