Google Checkout: Offering Multiple Options when Adding to Cart -

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i'm using google checkout merchant account , i'm having difficulty add cart code when try have multiple options 1 product.

specifically, want sell **paint** , give customers 2 options: **size** (5-gallon, gallon, quart) , **color** (100s of colors) , use 1 add cart button:

**paint**      **size**    **color**    **add cart**

is possible? or need have 3 add cart buttons?

**paint**      **5-gallon**    **color**    **add cart**
**paint**      **gallon**    **color**    **add cart**
**paint**      **quart**    **color**    **add cart**

thanks,
thomas pauly

for best user experience, may want build cart (which allow alternate user interface, such drop down tin size, or colour picker choose available shades) - can use xml api transmit nice version of cart google.


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