Javascript Error: Cannot read property 'click' of undefined

I am getting the following Console Error:

Uncaught TypeError: Cannot read property 'click' of undefined

it is referencing the following javascript code:

function openChatWindow() {

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does the element returned by document.getElementById("lpHeaderEngagement") have any child elements?
tekgrlAuthor Commented:
No. No child elements.
That's why the error occurs. You should check if there any child elements before attempting to call their function.
var header_engagement_first_child = document.getElementById("lpHeaderEngagement").childNodes[0];
if( header_engagement_first_child && );

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