Embedding a dynamic image in an html page

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Javascript

Dear Guys,

can any one help me to the above topic.

1) I am getting an image in the format base64String from an applet.
2) I am storing that in javascript variable.
3) There is a button in the HTML page, i had created a javascript function which will be executed when that button is pressed.

Now i want to place that image in an image tag in the same html page when pressing the same button.

var docImage :- contains the Base64 string
doc_image : - is the image tag name.

i tried this code snippet
document.getElementById('doc_image').src = "data:image/png,base64," ' + docImage +';

need help :)