function newSize(ImgTag,FitWidth,FitHeight) 
{ 
var image = new Image(); 
image.src = ImgTag.src; 
if(image.width>0 && image.height>0){ 
if(image.width/image.height >= FitWidth/FitHeight){ 
if(image.width > FitWidth){ 
ImgTag.width = FitWidth; 
ImgTag.height = (image.height*FitWidth)/image.width; 
} 
else{ 
ImgTag.width = image.width; 
ImgTag.height = image.height; 
} 
} 
else{ 
if(image.height > FitHeight){ 
ImgTag.height = FitHeight; 
ImgTag.width = (image.width*FitHeight)/image.height; 
} 
else{ 
ImgTag.width = image.width; 
ImgTag.height = image.height; 
} 
} 
} 
}