How is a page in the src of img got triggered?

[wow]

Hi there,

Do you expect "/Consumer/CValidateCode.ashx" in the below <img> src bring a picture to show?

<li>Gotcha：<input id="txtCCPwd" class="edtText" type="text" 
style="width:70px;" maxlength="4">
<img class="Validate_Img" title="Click to refresh！" 
onclick="javascript:this.src='/Consumer/CValidateCode.ashx?' + Math.random();" 
src="/Consumer/CValidateCode.ashx">
</li>

But how below doesn't show the picture? What's wrong? This is about getting a picture from server for gotcha purpose.

<div class="table-td">
<input id="login-valid" class="login-Text2" type="text" maxlength="4">
<img class="login-CodeImg" 
onclick="javascript:this.src='/id/verifycode.php?'+Math.random();" 
alt="Click to refresh" src="/id/verifycode.php?0.3315922001265288">
</div>

Thanks,