function changeImg(mypic,iw,ih){ 
    var xw=iw; 
    var xl=ih; 

    var width = mypic.width; 
    var height = mypic.height; 
    var bili = width/height; 



    var A=xw/width; 
    var B=xl/height; 

    if(!(A>1&&B>1)) 
    { 
        if(A<B) 
        { 
            mypic.width=xw; 
            mypic.height=xw/bili; 
        } 
        if(A>B) 
        { 
            mypic.width=xl*bili; 
            mypic.height=xl; 
        } 
    } 
} 

var flag=false; 
function DrawImage(ImgD,wt,ht)
{
     
    var image=new Image(); 
    image.src=ImgD.src; 
    if(image.width>0 && image.height>0)
    { 
      flag=true; 
    if(image.width/image.height>=wt/ht)
    { 
    if(image.width>wt)
    { 
        ImgD.width=wt; 
        ImgD.height=(image.height*ht)/image.width; 
    }
    else
    { 
        ImgD.width=image.width; 
        ImgD.height=image.height; 
    } 
    /*ImgD.alt="bigpic" */ 
    } 
    else
    { 
    if(image.height>ht)
    { 
        ImgD.height=ht; 
        ImgD.width=(image.width*ht)/image.height; 
    }
    else
    { 
        ImgD.width=image.width; 
        ImgD.height=image.height; 
    } 
    /*ImgD.alt="bigpic" */ 
    } 
    } 
}