var moveStyle;
var rand = parseInt(Math.random() * 4);
switch (rand) {
    case 0: moveStyle = "left"; break;
    case 1: moveStyle = "right"; break;
    case 2: moveStyle = "down"; break;
    case 3: moveStyle = "up"; break;
}

$("#indexPic").KinSlideshow({ moveStyle: moveStyle, isHasTitleBar:false,isHasTitleFont:false });