another responsive problem

I know there are too many topics about this but I can't get it done.
I have set width to auto and height to % but the image will start to shrink if I resize my browser but it goes to a point when the image will just stay as it is and won't resize any more. The image will display huge on my mobile browser.
My site is pet-city.com.mx
Thank you so much for your help

Hi
this is because you have a fixed width on the slideshow container into your template with

.ttr_banner_menu {
margin: 0 auto;
width: 901px;
}

remove the width of 901px and it will be ok. not related to the slideshow
CEd