用按钮控制一组图片左右移动，图片都显示完了，如何不再重复显示？
小弟还不太懂js，只会找些代码复制，做些简单修改，可是这段代码不知道怎么改，我想向左的按钮到头了就不再重复显示图片了，不知道应该添加一段代码还是删除一段，希望高手指导一下！！<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.
<html xmlns="http://www.
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta name="keywords" content="模范" />
<meta name="description" content="模范" />
<title></title>
<script language="javascript">
var Speed_1 = 10; //速度(毫秒)
var Space_1 = 10; //每次移动(px)
var PageWidth_1 = 210 * 1; //翻页宽度
var interval_1 = 7000; //翻页间隔
var fill_1 = 0; //整体移位
var MoveLock_1 = false;
var MoveTimeObj_1;
var MoveWay_1="right";
var Comp_1 = 0;
var AutoPlayObj_1=null;
function GetObj(objName){if(document.getElementById){return eval('document.getElementById("'+objName+'")')}else{return eval('document.all.'+objName)}}
function AutoPlay_1(){clearInterval(AutoPlayObj_1);AutoPlayObj_1=setInterval('ISL_GoDown_1();ISL_StopDown_1();',interval_1)}
function ISL_GoUp_1(){if(MoveLock_1)return;clearInterval(AutoPlayObj_1);MoveLock_1=true;MoveWay_1="left";MoveTimeObj_1=setInterval('ISL_ScrUp_1();',Speed_1);}
function ISL_StopUp_1(){if(MoveWay_1 == "right"){return};clearInterval(MoveTimeObj_1);if((GetObj('ISL_Cont_1').scrollLeft-fill_1)%PageWidth_1!=0){Comp_1=fill_1-(GetObj('ISL_Cont_1').scrollLeft%PageWidth_1);CompScr_1()}else{MoveLock_1=false}
AutoPlay_1()}
function ISL_ScrUp_1(){if(GetObj('ISL_Cont_1').scrollLeft<=0){GetObj('ISL_Cont_1').scrollLeft=GetObj('ISL_Cont_1').scrollLeft+GetObj('List1_1').offsetWidth}
GetObj('ISL_Cont_1').scrollLeft-=Space_1}
function ISL_GoDown_1(){clearInterval(MoveTimeObj_1);if(MoveLock_1)return;clearInterval(AutoPlayObj_1);MoveLock_1=true;MoveWay_1="right";ISL_ScrDown_1();MoveTimeObj_1=setInterval('ISL_ScrDown_1()',Speed_1)}
function ISL_StopDown_1(){if(MoveWay_1 == "left"){return};clearInterval(MoveTimeObj_1);if(GetObj('ISL_Cont_1').scrollLeft%PageWidth_1-(fill_1>=0?fill_1:fill_1+1)!=0){Comp_1=PageWidth_1-GetObj('ISL_Cont_1').scrollLeft%PageWidth_1+fill_1;CompScr_1()}else{MoveLock_1=false}
AutoPlay_1()}
function ISL_ScrDown_1(){if(GetObj('ISL_Cont_1').scrollLeft>=GetObj('List1_1').scrollWidth){GetObj('ISL_Cont_1').scrollLeft=GetObj('ISL_Cont_1').scrollLeft-GetObj('List1_1').scrollWidth}
GetObj('ISL_Cont_1').scrollLeft+=Space_1}
function CompScr_1(){if(Comp_1==0){MoveLock_1=false;return}
var num,TempSpeed=Speed_1,TempSpace=Space_1;if(Math.abs(Comp_1)<PageWidth_1/2){TempSpace=Math.round(Math.abs(Comp_1/Space_1));if(TempSpace<1){TempSpace=1}}
if(Comp_1<0){if(Comp_1<-TempSpace){Comp_1+=TempSpace;num=TempSpace}else{num=-Comp_1;Comp_1=0}
GetObj('ISL_Cont_1').scrollLeft-=num;setTimeout('CompScr_1()',TempSpeed)}else{if(Comp_1>TempSpace){Comp_1-=TempSpace;num=TempSpace}else{num=Comp_1;Comp_1=0}
GetObj('ISL_Cont_1').scrollLeft+=num;setTimeout('CompScr_1()',TempSpeed)}}
</script>
<style type="text/css">
BODY {
BORDER-TOP-WIDTH: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12px; BORDER-BOTTOM-WIDTH: 0px; MARGIN: 0px; FONT-FAMILY: 宋体; BACKGROUND-COLOR: #fff; BORDER-RIGHT-WIDTH: 0px
}
.blk_18 {
BORDER-RIGHT: #e3e3e3 1px solid; BORDER-TOP: #e3e3e3 1px solid; MARGIN-TOP: 8px; FONT-SIZE: 12px; BACKGROUND: #f3f3f3; OVERFLOW: hidden; BORDER-LEFT: #e3e3e3 1px solid; WIDTH: 820px; BORDER-BOTTOM: #e3e3e3 1px solid; ZOOM: 1
}
.blk_18 .pcont {
FLOAT: left; OVERFLOW: hidden; WIDTH: 780px
}
.blk_18 .ScrCont {
WIDTH: 1410px; ZOOM: 1
}
.blk_18 #List1_1 {
FLOAT: left
}
.blk_18 #List2_1 {
FLOAT: left
}
.blk_18 .LeftBotton {
BACKGROUND: url(image/picr_1.gif) no-repeat; FLOAT: left; MARGIN: 10px 1px; WIDTH: 15px; HEIGHT: 72px
}
.blk_18 .RightBotton {
BACKGROUND: url(image/picr_1.gif) no-repeat; FLOAT: left; MARGIN: 10px 1px; WIDTH: 15px; HEIGHT: 72px
}
.blk_18 .LeftBotton {
BACKGROUND-POSITION: 0px 0px; MARGIN-LEFT: 5px
}
.blk_18 .RightBotton {
BACKGROUND-POSITION: 0px -100px; MARGIN-LEFT: -1px
}
.blk_18 .LeftBotton:hover {
BACKGROUND-POSITION: -20px 0px
}
.blk_18 .RightBotton:hover {
BACKGROUND-POSITION: -20px -100px
}
.blk_18 .pl IMG {
DISPLAY: block; MARGIN: 6px auto 1px; CURSOR: pointer; BORDER-TOP-STYLE: none; BORDER-RIGHT-STYLE: none; BORDER-LEFT-STYLE: none; BORDER-BOTTOM-STYLE: none
}
.blk_18 .pl {
BORDER-RIGHT: #f3f3f3 1px solid; BORDER-TOP: #f3f3f3 1px solid; FLOAT: left; BORDER-LEFT: #f3f3f3 1px solid; WIDTH: 114px; LINE-HEIGHT: 24px; BORDER-BOTTOM: #f3f3f3 1px solid; TEXT-ALIGN: center; TEXT-DECORATION: underline
}
.commu_cont3 {
MARGIN: 9px 7px 7px; LINE-HEIGHT: 150%
}
.commu_cont3 UL {
WIDTH: 188px
}
</style>
</head>
<!-- picrotate_left start -->
<DIV class="blk_18"><A onmouseup="ISL_StopUp_1()" class="LeftBotton" onmousedown="ISL_GoUp_1()" onmouseout="ISL_StopUp_1()" href="javascript:void(0);" target="_self"></A>
<DIV class="pcont" id="ISL_Cont_1">
<DIV class="ScrCont">
<DIV id="List1_1">
<!-- piclist begin -->
<img src="image/f_00.jpg" width="83" height="150"/>
<img src="image/f_01.jpg" width="200" height="150"/>
<img src="image/f_02.jpg" width="200" height="150"/>
<img src="image/f_03.jpg" width="200" height="150"/>
<img src="image/f_04.jpg" width="200" height="150"/>
<img src="image/f_05.jpg" width="200" height="150"/>
<img src="image/f_06.jpg" width="200" height="150"/>
<img src="image/f_99.jpg" width="82" height="150"/>
</DIV>
<DIV id="List2_1">
</DIV>
</DIV>
</DIV>
<A onmouseup="ISL_StopDown_1()" class="RightBotton" onmousedown="ISL_GoDown_1()" onmouseout="ISL_StopDown_1()" href="javascript:void(0);" target="_self"></A>
</DIV>
<!-- picrotate_left end -->
</body>
</html>
