If i am right you have a table with 3 rows or similar, ( maybe an extra column for the buy now buttons that you set up up in pay-pal. If so you do not attach the images to these places but instead try this.
In each section of your table where you want to ad the button for each option type the word : Button1" , and the same for the other 2 buttons where you want then, then in pay-pal you should have some script for each button, / payment option, copy this script then return to your table, then select the source option in the top left corner.
In the source code for the HTML, find the words button1. ( for example ) highlight the text and then paste the code from pay pal over the top of it replacing it, do the same for the other 2 buttons. ( if possible creating a new row or column for these buttons would be better for alignment but not needed, you should also be able to edit the button size and or even change the button image from here.
As mentioned above there are also modules available that do this sort of thing for you , allowing you to dial up payment options and it really does depend on what it is you need to create that would be your best option ( inventu has one of these that may help )