In my http:\\www.bvision.nl blog I changed the colors to the colors used in the Montezuma theme. But how do I change the boxes next to the items in the sidebar to the used images in that theme? I tried in the widgetoptions: list-style-image: url('http://www.bvision.nl/wp-content/themes/atahualpa3/images/dart.gif');
that doesn't work. I tried the code in w3 and there it works well.

Montezuma is not done with list-style-image but background-images

Not tested, I took this from the Montezuma theme

 .widget ul {
    margin:0; 
    padding: 0; 
    list-style : none;
    }
    
.widget ul li {
    margin: 0 0 2px 0;  
    list-style: none; 
    line-height: 17px; 
    position:relative;
    background: #b1b6d1 url(/wp-content/themes/atahualpa3/images/dart.gif) no-repeat top left; 
    }
    
.widget ul li ul li {
    background: #b1b6d1 url(/wp-content/themes/atahualpa3/images/dart2.gif) no-repeat top left; 
    }
    
.widget ul li a {
    text-decoration: none; 
    font-weight: normal; 
    color: #42476f; 
    padding-left: 15px; 
    display:block
    }
    
.widget ul li ul li a {
    padding-left: 18px; 
    }
    
.widget ul li a:hover {
    text-decoration: underline;
    }
    
* html .widget ul li a {
    display:inline-block /* IE6 needs inline-block */
    }

Good job on matching Atahualpa to Montezuma.

Thanks a lot, I see there's a lot to figure out to implement this in 3.18. and afther that to consider by upgrades.