video fancybox jumping on top in javascript

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Javascript

jQuery

hello,

I had this code to stream youtube video on fancy box :

//Fancybox Yooutube popup
       jQuery(document).ready(function () {

           $(".fancybox-video").click(function () {
               $.fancybox({
                   'padding': 0,
                   'autoScale': false,
                   'transitionIn': 'none',
                   'transitionOut': 'none',
                   'title': this.title,
                   'width': 640,
                   'height': 385,
                   'href': this.href.replace(new RegExp("watch\\?v=", "i"), 'v/'),
                   'type': 'swf',
                   'swf': {
                       'wmode': 'transparent',
                       'allowfullscreen': 'true'
                   }
               });

               return false;
           });
       });

but I had a problem : jumping to the top of the page when click on the video

how can I fix it ?

I was using this code for fancybox images to prevent jump to the top :

helpers: {
                    overlay: {
                        locked: false
                    }
                }

but actually I do not know where I should put it in this fancybox code.