//按比例压缩图
var ImageOpr = {
  flag:false,
  //iwidth 定义允许图片宽度，当宽度大于这个值时等比例缩小
  //iheight 定义允许图片高度，当宽度大于这个值时等比例缩小
  DrawImage:function(ImgD,iwidth,iheight){
    var image=new Image();
    image.src=ImgD.src;
     if(image.width>0 && image.height>0){
        flag=true;
        if(image.width/image.height>= iwidth/iheight){
            if(image.width>iwidth){ 
              ImgD.width=iwidth;
              ImgD.height=(image.height*iwidth)/image.width;
            }else{
              ImgD.width=image.width; 
              ImgD.height=image.height;
            }
            ImgD.alt=image.width+"×"+image.height;
        }
        else{
          if(image.height>iheight){ 
            ImgD.height=iheight;
            ImgD.width=(image.width*iheight)/image.height; 
          }else{
            ImgD.width=image.width; 
            ImgD.height=image.height;
          }
            ImgD.alt=image.width+"×"+image.height;
        }
      }
   }
}
//漂浮广告
var serNav = {
    resize: function(i) {
        window.onresize = function() {
            serNav.redraw();
        }
        serNav.redraw();
    },
    redraw: function() {
      var mainWidth =  $("#main").width();
        var leftobj = $("#leftNav");         
        leftobj.css("left",(document.body.scrollWidth-mainWidth)/2);
        
        var rightobj = $("#rightNav");
        rightobj.css("left",((document.body.scrollWidth-mainWidth)/2)+mainWidth-87);
    }
 }