溢出时页面向上移动：隐藏的css属性仅在Firefox中设置为标记

My webpage height is quite long, i have a requirement like when i have a modal dialog in the page, page scroll bar has to be disabled. Since the modal dialog has a scroll bar in it once the modal dialog scroll bar comes to an end, page scroll bar will be activated. To fix this i have added this code to JQuery modal dialog method.My webpage height is quite long, i have a requi