//图片等比例缩放
function DrawImage(ImgD,iwidth,iheight)
{
    //参数(图片,允许的宽度,允许的高度)
    var image=new Image();
    image.src=ImgD.src;
    if(image.width>0 && image.height>0)
    {
    //document.write(image.width);
        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;
            }  
        }
        else
        {
            if(image.height>iheight)
            {  
                ImgD.height=iheight;
                ImgD.width=(image.width*iheight)/image.height;        
            }
            else
            {
                ImgD.width=image.width;  
                ImgD.height=image.height;
            }    
        }
    }
}

//屏弊回车提交事件
function keyup_memberLogin()
{
   if(event.keyCode==13)
   {
       if( event.srcElement.type!="image" && event.srcElement.type!="button")
       {
            event.keyCode=9;
       }
   }  
}