帮忙看段代码

<head>
<script language=javaScript>
<!--//
sandra0 = new Image();
sandra0.src = "../photo/1.0.jpg";
sandra1 = new Image();
sandra1.src = "../photo/1.1.jpg";
sandra2 = new Image();
sandra2.src = "../photo/1.2.jpg";
sandra2 = new Image();
sandra2.src = "../photo/1.3.jpg";
sandra2 = new Image();
sandra2.src = "../photo/1.4.jpg";
sandra2 = new Image();
sandra2.src = "../photo/1.5.jpg";
sandra2 = new Image();
sandra2.src = "../photo/1.6.jpg";
sandra2 = new Image();
sandra2.src = "../photo/1.7.jpg";
sandra2 = new Image();
sandra2.src = "../photo/1.8.jpg";
sandra2 = new Image();
sandra2.src = "../photo/1.9.jpg";
sandra2 = new Image();
sandra2.src = "../photo/2.0.jpg";
sandra2 = new Image();
sandra2.src = "../photo/2.1.jpg";
sandra2 = new Image();
sandra2.src = "../photo/2.2.jpg";
sandra2 = new Image();
sandra2.src = "../photo/2.3.jpg";
sandra2 = new Image();
sandra2.src = "../photo/2.4.jpg";
var i_strngth=1
var i_image=0
var imageurl = new Array()
imageurl[0] ="../photo/1.0.jpg"
imageurl[1] ="../photo/1.1.jpg"
imageurl[2] ="../photo/1.2.jpg"
imageurl[3] ="../photo/1.3.jpg"
imageurl[4] ="../photo/1.4.jpg"
imageurl[5] ="../photo/1.5.jpg"
imageurl[6] ="../photo/1.6.jpg"
imageurl[7] ="../photo/1.7.jpg"
imageurl[8] ="../photo/1.8.jpg"
imageurl[9] ="../photo/1.9.jpg"
imageurl[10] ="../photo/2.0.jpg"
imageurl[11] ="../photo/2.1.jpg"
imageurl[12] ="../photo/2.2.jpg"
imageurl[13] ="../photo/2.3.jpg"
imageurl[14] ="../photo/2.4.jpg"