function sharesina() {    window.open("http://service.weibo.com/share/mobile.php?&title=&pic=&url=");}function shareqq() {    window.open("http://share.v.t.qq.com/index.php?c=share&a=index&url=&appkey=&assname=&title=&pic=");}function sharerenren() {    window.open("http://widget.renren.com/dialog/forward?api_key=&url=&title=&images=&content=");}