var flag=false; 
function setpicWH(ImgD,w,h){ 
var image=new Image(); 
image.src=ImgD.src; 
if(image.width>0 && image.height>0){ 
flag=true; 
if(image.width/image.height>= w/h){ 
if(image.width>w){  
ImgD.width=w; 
ImgD.height=(image.height*w)/image.width; 
ImgD.style.display="block";
}else{ 
ImgD.width=image.width;  
ImgD.height=image.height; 
ImgD.style.display="block";
} 
} 
else{ 
if(image.height>h){  
ImgD.height=h; 
ImgD.width=(image.width*h)/image.height; 
ImgD.style.display="block"; 
}else{ 
ImgD.width=image.width;  
ImgD.height=image.height; 
ImgD.style.display="block";
} 
} 
} 
}