function ImgReSize(img, iw, ih) {
	var imgWidth = iw;
	var imgHeight = ih;

	var w = img.width;
	var h = img.height;
	
	if(w > imgWidth && h < imgHeight)
		img.width = imgWidth;
	if(h > imgHeight && w < imgWidth)
		img.height = imgHeight;
	if(w > imgWidth && h > imgHeight)
	{
		if(w - imgWidth > h - imgHeight) img.width = imgWidth;
		if(h - imgHeight > w - imgWidth) img.height = imgHeight;
	}
}

function ImgReSize2(img, iw, ih) {
	var imgWidth = iw;
	var imgHeight = ih;
	var w = img.width;
	var h = img.height;
	
	if(w > 510) {
           img.width = 510;
        } else {
           ImgReSize(img, iw, ih);
        }
}