单击image href=#时，它会滚动到顶部

下面是我在网站上使用的代码每个图像链接都设置为在单击时前进到下一个图像问题是，当我点击图像时，页面会滚动回顶部。我想停止

我在onclick标记上使用了return false标记，但当单击图像时，它会连续滚动图像数组。

有什么解决方案吗？下面是我的代码

<script language="JavaScript">
  <!-- -->

var interval = 1500;
var random_display = 0;
var imageDir = "imgs/";
var imageNum = 0;
imageArray = new Array();
imageArray[imageNum++] = new imageItem(imageDir + "1.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "2.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "3.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "4.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "5.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "6.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "7.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "8.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "9.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "10.jpg");
var imageNumTwo = 0;
imageArrayTwo = new Array();
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t1.jpg");
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t2.jpg");
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t3.jpg");
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t4.jpg");
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t5.jpg");
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t6.jpg");
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t7.jpg");
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t8.jpg");
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t9.jpg");
imageArrayTwo[imageNumTwo++] = new imageItem(imageDir + "t10.jpg"); 
var imageNumThree = 0;
imageArrayThree = new Array();
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th1.jpg");
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th2.jpg");
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th3.jpg");
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th4.jpg");
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th5.jpg");
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th6.jpg");
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th7.jpg");
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th8.jpg");
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th9.jpg");
imageArrayThree[imageNumThree++] = new imageItem(imageDir + "th10.jpg");    

var totalImages = imageArray.length;
var totalImagesTwo = imageArrayTwo.length;
var totalImagesThree = imageArrayThree.length;
function imageItem(image_location) {
    this.image_item = new Image();
    this.image_item.src = image_location;
}
function get_ImageItemLocation(imageObj) {
    return(imageObj.image_item.src)
}

function randNum(x, y) {
    var range = y - x + 1;
    return Math.floor(Math.random() * range) + x;
}
function getNextImage() {
    if (random_display) {
        imageNum = randNum(0, totalImages-1);
    }
    else {
        imageNum = (imageNum+1) % totalImages;
    }   
    var new_image = get_ImageItemLocation(imageArray[imageNum]);
return(new_image);
}

function getNextImageTwo() {
    if (random_display) {
        imageNumTwo = randNum(0, totalImagesTwo-1);
    }
    else {
        imageNumTwo = (imageNumTwo+1) % totalImagesTwo;
    }   
    var new_image = get_ImageItemLocation(imageArrayTwo[imageNumTwo]);
return(new_image);
}

function getNextImageThree() {
    if (random_display) {
        imageNumThree = randNum(0, totalImagesTwo-1);
    }
    else {
        imageNumThree = (imageNumThree+1) % totalImagesThree;
    }   
    var new_image = get_ImageItemLocation(imageArrayThree[imageNumThree]);
return(new_image);
}

function prevImage(place) {
    var new_image = getPrevImage();
    document[place].src = new_image;
}
function switchImage(place) {
    var new_image = getNextImage();
    document[place].src = new_image;
    var recur_call = "switchImage('"+place+"')";
    timerID = setTimeout(recur_call, interval);
    }
function switchImageTwo(place) {
    var new_image = getNextImageTwo();
    document[place].src = new_image;
    var recur_call = "switchImageTwo('"+place+"')";
    timerID = setTimeout(recur_call, interval);
    }

function switchImageThree(place) {
    var new_image = getNextImageThree();
    document[place].src = new_image;
    var recur_call = "switchImageThree('"+place+"')";
    timerID = setTimeout(recur_call, interval);
    }

</script>


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  <a href="#" onclick="switchImageTwo('slideImg2'); clearTimeout(timerID)"><img src="imgs/t1.jpg" name="slideImg2" width="300" height="423" border="0"></a>
  <img src="imgs/px.gif" width="40">
  <a href="#" onclick="switchImageThree('slideImg3'); clearTimeout(timerID)"><img src="imgs/th1.jpg" name="slideImg3" width="300" height="427" border="0"></a>
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