Vertical menu - image shift

Hi

I have created a vertical menu using CSS, but when loading the pages, the images are initally not (vertically aligned). When browsing the other pages, finally the images are properly aligned.
Where do I have to look at . I do not use any scaling of the images.

Some CSS code

.rf #sidebar1 {
	float: left; /* since this element is floated, a width must be given */
	width: 100px; /* the actual width of this div, in standards-compliant browsers, or standards mode in Internet Explorer will include the padding and border in addition to the width */

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