Find the js code of img's src address under div

Purpose: Find the src of img under div
html:
<div ><img src="" /></div>
<div ><img src="" /></div>
.
.
<div ><img src="" /></div>

My error code:
initImage();
loadImage();
function initImage() {
for(var i=1;i<13;i++) {
imageId[i]=("image"+i);
}
}
function loadImage() {
for(var j=1;j<13;j++){
imageList[j]=imageId[j].getElementsByTagName("img")[0];
if(imageId[j].src=="images/")
imageId[j].src="images/"+j+".gif";
else..........
}
}
Code to solve the problem

Copy the codeThe code is as follows:

<div >
<div><img src="" /></div> 
<div><img src="" /></div> 
</div> 
<script> 
function imglist(obj) 
{ 
var imglist=(obj).getElementsByTagName('IMG') 
for (i=0;i<;i++ ) 
{ 
if(imglist[i].("",0)!=-1){imglist[i].src="imgage/"+i+".gif";} 
alert(imglist[i].src) //The test is successful
} 
} 
</script> 
<input onclick="imglist('listimg')" value="test" type="button">