Changin a div border with javascript

I have created a div programaticaly using.

var Element;
Element = document.createElement('div');

Now I want to change the right and bottom border to "#CCCCCC 1px solid".

I don't want to use a library for this and using CSS clas开发者_运维问答ses is not possible.

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element.style.borderRight = element.style.borderBottom = "#CCCCCC 1px solid";

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Element.setAttribute("style", "bottom-right: #CCCCCC 1px solid"); ?