我需要问我的网站用户一个是/否的问题。在javaScript中

I need to ask my web site's user a Yes/ No question. Currently I use JavaScript's confirm() function. The return value is true (OK) or false (CANCEL). The word CANCEL is misleading. I want to have the buttons say Yes/ No instead. How can I do it? i m using php..I need to ask my web site's user a Yes/ No ques