//等比缩放代码
var flag=false; 
function DrawImage(ImgD,FitWidth,FitHeight){    
  var image=new Image();    
  image.src=ImgD.src; 
  
  if(image.width>0 && image.height>0){     
    flag=true;     
    if(image.width/image.height>= FitWidth/FitHeight){      
      if(image.width>FitWidth){        
        ImgD.width=FitWidth;      
     ImgD.height=(image.height*FitWidth)/image.width;      
      }else{      
        ImgD.width=image.width;        
     ImgD.height=image.height;      
      }      
      //ImgD.alt="点击图片放大("+image.width+"×"+image.height+")";      
    }else{      
      if(image.height>FitHeight){        
        ImgD.height=FitHeight;      
     ImgD.width=(image.width*FitHeight)/image.height;          
      }else{      
        ImgD.width=image.width;        
     ImgD.height=image.height;      
      }      
      //ImgD.alt="点击图片放大("+image.width+"×"+image.height+")";      
      }     
    } 
  } 
//字体大中小
function doZoom(size)
{document.getElementById('zoom').style.fontSize=size+'px';}
//防copy代码
//document.oncontextmenu=new Function("event.returnValue=false;");
//document.onselectstart=new Function("event.returnValue=false;");
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