Integration testing means checking datflow from one module 
to another 

so  integration testing is not possible for above

its possible to write integration test case for this as you 
have a home page and a new child window which opens when 
you click on it.It opens another page, navigating to 
another page can also be called as an inetgration testing.

Test case for Amount field

1. eneter characters only
2. enter special characters
3.when u move cursor to text field it should change to
insertion point
4. enter valid data ( numbers)
5.enter the numbers to maximum field length
6. enter negetive mumbers
7. leave the field blank
8.check for amount format ( does it take decimals)
etc..

Test case for check box 
1. check for label name
2.check for alignment
3.click on the check box 
3. click on the check box and then press space bar it should
uncheck
etc..

Test case for ok 
1. check for allignment
2.enter the valid data and click ok it should navigate to
next page
3.without entering any field click ok

Test case for cancel field
1.clcik on cancel field 
2.check for allignment
etc

thanks