//����΢��ͼƬJS����
//����imgID��ͼƬ�ı�ʶID��
//����maxWidth��ͼƬ������ȣ�ֵΪ0���ʾ�����ƿ�ȣ�
//����maxHeight��ͼƬ�����߶ȣ�ֵΪ0���ʾ�����Ƹ߶ȣ�
function setImgSize(imgID,maxWidth,maxHeight)
{
	var img = imgID;
	if(maxWidth < 1)
	{
	    if(img.height > maxHeight)
	    {
	        img.height = maxHeight;
	    }
	    return true;
	}
	if(maxHeight < 1)
	{
	    if(img.width > maxWidth)
	    {
	        img.width = maxWidth;
	    }
	    return true;
	}
	if(img.height > maxHeight || img.width > maxWidth)
	{
	    if((img.height / maxHeight) > (img.width / maxWidth))
	    {
	        img.height = maxHeight;
	    }
	    else
	    {
	        img.width = maxWidth;
	    }
	    return true;
	}
}