Update 2 exact same images source using javascript

I using PHP captcha called Cryptographer captchan.fr site

I need to use 2 captcha on same page but i have problem they do get generated but when i click refresh only first one refreshes, refresh code looks like this.

document.images.captcha.src='cryptographp.html?cfg=0&&'+Math.round(Math.ran开发者_如何学Cdom(0)*1000)+1;

I tried this code but it only works for first one anyway

document.getElementById('captcha').src='cryptographp.html?cfg=0&&'+Math.round(Math.random(0)*1000)+1;

Now I wanted to do something like this I added name="captcha" to image but this does not work for some reason can someone help me fix it?

document.getElementsByName('captcha').src='cryptographp.html?cfg=0&&+Math.round(Math.random(0)*1000)+1;

I also have jquery attached to page if thats easier.

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You can't have more than one element with same ID on page. That may be why it's only hitting the first one. If you add a class to both images called "captcha" you can easily do this with jQuery:

$('.captcha').attr('src', 'cryptographp.html?cfg=0&&'+Math.round(Math.random(0)*1000)+1);