how to edit the width of menu bar in dreamweaver

any one can give me a quick indication. I am trying to create a menu bar on my website, but after put it on, don't know how to edit the website, and it show on dreamweaver is different show on the website after I upload it online. and I tried to edit the css file which can't change the width as w开发者_运维知识库ell.

please check the image that on the website here: http://www.xuanyinwen.com/images/temp/test.jpg

and on dreamweaver: http://www.xuanyinwen.com/images/temp/test1.jpg

Thank you very much for your time

Wayne

Dreamweaver is not a dependable tool for previewing HTML. Always preview it in the browser.

Dreamweaver will give you an approximate representation, but it will never be 100% accurate, especially when it comes to how your page will look in different browsers. It can't possibly represent three different rendering engines at the same time.