// JScript 文件
var flag=false;    
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){    
        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;  
            }
        }    
    }    
} 

