Problem: images in horizontal scrollbox with fixed size

I had problem, I need to insert 4 images in a div that works like horizontal scrollbox, images are same height, the size if scrollbox are fixed.
Why my images didn't stay near on the same line and wrap down?
This is a part of codes that i use:

part of css:
height: 220px;
width: 660px;
overflow: auto;
/* overflow-x:scroll ; */
/* overflow-y: hidden; */
white-space: nowrap;
margin-top: 15px;
margin-bottom: 10px;

/* margin-right: 10px;*/

part of web Sad(


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