Hmm. I am going to reiterate what all the other users on different forums have told you about this: contact the author.
What I do find interesting is that you are calling a Server Control directly by its name: document.getElementById("WebTextEdit1").style.back groundColor = '#F0F5F7'
Instead of
document.getElementById('<%=WebTextEdit1.ClientID% >').style.backgroundColor = '#F0F5F7'
In reality the first call should throw a JavaScript null error.
hth.
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