You can use background image to adjust background position properly:
li {
margin-left: 20px;
color: #3C4355;
line-height: 20px;
background: url('http://forum.bizportal.co.il/NewSite/emoticons/smiley9.gif') 0 0 no-repeat;
padding-left: 20px;
list-style-type: none;
}