javascript change image src

                                    document.getElementById("imageid").src="../template/save.png";

                                    <a href='#' onclick='edit()'><img src="../template/edit.png" id="edit-save"/></a>

                                    <script type="text/javascript">
    function changeImage(a) {
        document.getElementById("img").src=a.src;
    }
</script>
<div id="main_img">
    <img id="img" src="1772031_29_b.jpg">
</div>
<div id="thumb_img">
    <img src='1772031_29_t.jpg'  onclick='changeImage("1772031_29_b.jpg");'>
    <img src='1772031_55_t.jpg'  onclick='changeImage("1772031_55_b.jpg");'>
    <img src='1772031_53_t.jpg'  onclick='changeImage("1772031_53_b.jpg");'>
</div>

                                    // Pure JavaScript to Create img tag and add attributes manually ,
var image = document.createElement("img");
var imageParent = document.getElementById("body");
image.id = "id";
image.className = "class";
image.src = searchPic.src;            // image.src = "IMAGE URL/PATH"
imageParent.appendChild(image);

// Set src in pic1
document["#pic1"].src = searchPic.src;

// or with getElementById

document.getElementById("pic1").src= searchPic.src;

// jQuery to archive this,
$("#pic1").attr("src", searchPic.src);

                                    document.getElementById("myImg").src = "hackanm.gif";